texlive[65483] trunk: latexmk (7jan23)

commits+karl at tug.org commits+karl at tug.org
Sat Jan 7 22:23:15 CET 2023


Revision: 65483
          http://tug.org/svn/texlive?view=revision&revision=65483
Author:   karl
Date:     2023-01-07 22:23:15 +0100 (Sat, 07 Jan 2023)
Log Message:
-----------
latexmk (7jan23)

Modified Paths:
--------------
    trunk/Build/source/texk/texlive/linked_scripts/latexmk/latexmk.pl
    trunk/Master/texmf-dist/doc/man/man1/latexmk.1
    trunk/Master/texmf-dist/doc/man/man1/latexmk.man1.pdf
    trunk/Master/texmf-dist/doc/support/latexmk/CHANGES
    trunk/Master/texmf-dist/doc/support/latexmk/INSTALL
    trunk/Master/texmf-dist/doc/support/latexmk/README
    trunk/Master/texmf-dist/doc/support/latexmk/latexmk.pdf
    trunk/Master/texmf-dist/doc/support/latexmk/latexmk.txt
    trunk/Master/texmf-dist/scripts/latexmk/latexmk.pl

Modified: trunk/Build/source/texk/texlive/linked_scripts/latexmk/latexmk.pl
===================================================================
--- trunk/Build/source/texk/texlive/linked_scripts/latexmk/latexmk.pl	2023-01-07 21:22:46 UTC (rev 65482)
+++ trunk/Build/source/texk/texlive/linked_scripts/latexmk/latexmk.pl	2023-01-07 21:23:15 UTC (rev 65483)
@@ -1,8 +1,44 @@
 #!/usr/bin/env perl
 use warnings;
 
+# ???!!! TO DO 9 Aug 2022:
+#     0. RETHINK warning listing handling etc, including warnings as
+#        errors, bad warnings as errors.  Must systematize.  Code is too split
+#        up.
+# 1b. ===> In any case, check treatment of runs that give an error.
+# 2. Think generally through logic of error handling.  E.g., error in
+#    xelatex: should dvipdfmx be run?  (Or with config. variable for the
+#    post-primaries.)  Currently it's run.  Probably correct: viewed file,
+#    if it can be made, can be useful for error diagnosis.  Also:
+#    consistency between direct making of pdf file and indirect.
+#    But abort after error can also be useful.
+#    DONE 3. Are post-primaries guaranteed to be run in correct order?
+#    YES: See definition of @post_primary.
+# 4. Clean up rdb_diagnose_changes2.
+# COMMENTED OUT FOR NOW 5. Perhaps, remove use of kpsewhich in case of disappeared files?
+# 6. Review rdb_make and rdb_make1 again.
+# 7. Start in -pvc when prior run gave error: There's an error report after
+#    the first make.  Same outside -pvc if have error run, then run
+#    latexmk; it reports error from previous run.
+# 9, Re %pass and rdb_rerun_needed: Perhaps remove outside_make_loop, and
+#    have separate subroutine for use by make_preview_continuous, and
+#    standard rdb_rerun_needed calls it and then does its source_rule
+#    stuff.
+# 10. Do I need to make rdb_user_changes better?
+#
+# OK 12. Is classification of post_primary watertight?  They are intended to
+#     be outside any loop.  Start with target files, and call encountered
+#     rules post_primary until a primary is encountered.  That assumes that
+#     on the pathway to target from primary, source files are not generated
+#     by non-primary rules.
+#     There's no requirement for post_primaries to be outside dependency
+#     loops. The make algorithm handles that. All that matters is that this
+#     commonly so, and therefore we are doing an appropriate ordering of
+#     examination of rules, by pre-primary, primary, post-primary.
+#     Post-primaries always have primary as a prerequisite for the source
+#     files. 
 
-## Copyright John Collins 1998-2022
+## Copyright John Collins 1998-2023
 ##           (username jcc8 at node psu.edu)
 ##      (and thanks to David Coppit (username david at node coppit.org) 
 ##           for suggestions) 
@@ -43,8 +79,8 @@
 
 $my_name = 'latexmk';
 $My_name = 'Latexmk';
-$version_num = '4.78';
-$version_details = "$My_name, John Collins, 18 Nov. 2022. Version $version_num";
+$version_num = '4.79';
+$version_details = "$My_name, John Collins, 7 Jan. 2023. Version $version_num";
 
 use Config;
 use File::Basename;
@@ -82,6 +118,10 @@
 use Cwd "chdir";    # Ensure $ENV{PWD}  tracks cwd.
 use Digest::MD5;
 
+# **WARNING**: Don't import time; that overrides core function time(), and messes up
+#  
+use Time::HiRes;
+
 #################################################
 #
 #  Unicode set up to be used in latexmk
@@ -1304,9 +1344,14 @@
                         # To keep backward compatibility with older versions
                         # of latexmk, the default is to set
                         # $analyze_input_log_always to 1.
+$fls_uses_out_dir = 0;  # Whether fls file is to be in out directory (as with
+                        # pre-Oct-2020 MiKTeX), or in aux directory (as with
+                        # newer versions of MiKTeX).
+                        # If the implementation of *latex puts the fls file in
+                        # the other directory, I will copy it to the directory
+                        # I am configured to use.
 
 
-
 # Which kinds of file do I have requests to make?
 our ($dvi_mode, $pdf_mode, $postscript_mode, $xdv_mode,
      $cleanup_mode, $force_mode, $go_mode, $landscape_mode, $preview_mode, $preview_continuous_mode, $printout_mode );
@@ -1379,6 +1424,21 @@
 # Timing information
 # Whether to report processing time: 
 our $show_time = 0;
+
+# Whether times computed are clock times (HiRes) since Epoch, or are
+# processing times for this process and child processes, as reported by
+# times().  Second is the best, if accurate.  But on MSWin32, times()
+# appears not to included subprocess times, so we use clock time instead.
+our $times_are_clock = ($^O eq "MSWin32" );
+
+# Allowance for different granularity in time since Epoch and file mtime.
+# Needed in testing whether a file was generated during a run of a program.
+# FAT file system: 2 sec granularity. Others 1 sec or less.
+# Perl CORE's mtime in stat: 1 sec.
+# Perl CORE's time(): 1 sec.  Time::HiRes::time(): Much less than 1 sec.
+our $filetime_slop = 2;
+
+
 # Data for 1 run and global (ending in '0'):
 our ( $processing_time1, $processing_time0, @timings1, @timings0);
 &init_timing_all;
@@ -2206,7 +2266,7 @@
     &exit_help( "Bad options specified" );
 }
 
-print "$My_name: This is $version_details, version: $version_num.\n",
+print "$My_name: This is $version_details.\n",
    unless $silent;
 
 &config_to_mine;
@@ -2691,15 +2751,12 @@
                     );
         &rdb_set_rule_net;
     }
+
     # At this point, the file and rule databases are correctly initialized
     # either from the fdb_latexmk database (corresponding to the state at
     # the end of the previous run of latexmk), or from default initialization,
     # assisted by dependency information from log files about previous
     # run, if the log file exists.
-    # PERHAPS if fdb_latexmk doesn't exist but appropriate output files exist,
-    #   we could assume there was a previous run that completed.  Then new
-    #   run of *latex etc isn't needed until files are changed; then we
-    #   should set the file data from the on-disk state.
 
     if ( $cleanup_mode ) { &do_small_cleanup; }
     if ( $cleanup_mode == 1 ) { &do_extra_cleanup; }
@@ -2709,17 +2766,14 @@
         # No aux file => set up trivial aux file 
         #    and corresponding fdb_file.  Arrange them to provoke one run 
         #    as minimum, but no more if actual aux file is trivial.
-        #    (Useful on big files without cross references.)
+        #    (Useful on short simple files.)
         # If aux file doesn't exist, then any fdb file is surely
-        #    wrong.
-        # Previously, I had condition for this as being both aux and
-        #    fdb files failing to exist.  But it's not obvious what to
-        #    do if aux exists and fdb doesn't.  So I won't do anything.
+        #    wrong. So updating it to current state is sensible.
+        print( "No existing .aux file, so I'll make a simple one, and require run of *latex.\n")
+            unless $silent;
         &set_trivial_aux_fdb;
     }
 
-
-
     if ($go_mode == 3) {
         # Force primaries to be remade.
         if (!$silent) { print "Force *latex to be remade.\n"; }
@@ -3255,13 +3309,16 @@
     }
     #   ???!!!  REVISE
     foreach my $rule ( keys %rule_template ) {
-        my ( $cmd_type, $ext_cmd, $int_cmd, $source, $dest, $base, $DUMMY, $PA_extra_gen ) = @{$rule_template{$rule}};
+        my ( $cmd_type, $ext_cmd, $int_cmd, $source, $dest, $base,
+             $DUMMY, $PA_extra_gen, $PA_extra_source )
+            = @{$rule_template{$rule}};
         if ( ! $PA_extra_gen ) { $PA_extra_gen = []; }
+        if ( ! $PA_extra_source ) { $PA_extra_source = []; }
         my $needs_making = 0;
         # Substitute in the filename variables, since we will use
         # those for determining filenames.  But delay expanding $cmd 
         # until run time, in case of changes.
-        foreach ($base, $source, $dest, @$PA_extra_gen ) {
+        foreach ($base, $source, $dest, @$PA_extra_gen, @$PA_extra_source ) {
             s/%R/$root_filename/g;
             s/%Y/$aux_dir1/;
             s/%Z/$out_dir1/;
@@ -3272,7 +3329,7 @@
         }
         rdb_create_rule( $rule, $cmd_type, $ext_cmd, $int_cmd, $DUMMY, 
                          $source, $dest, $base,
-                         $needs_making, undef, undef, 1, $PA_extra_gen );
+                         $needs_making, undef, undef, 1, $PA_extra_gen, $PA_extra_source );
     } # End rule iteration
 
     # At this point, all the rules are active.
@@ -3356,11 +3413,11 @@
     my $PA_update = ['do_update_view', $viewer_update_method, $viewer_update_signal, 0, 1];
 
     %rule_list = (
-        'dvilualatex'  => [ 'primary',  "$dvilualatex",  '',      "%T",        $dvi_name,  "%R",   1, [$log_name] ],
-        'latex'     => [ 'primary',  "$latex",     '',            "%T",        $dvi_name,  "%R",   1, [$log_name] ],
-        'lualatex'  => [ 'primary',  "$lualatex",  '',            "%T",        $pdf_name,  "%R",   1, [$log_name] ],
-        'pdflatex'  => [ 'primary',  "$pdflatex",  '',            "%T",        $pdf_name,  "%R",   1, [$log_name] ],
-        'xelatex'   => [ 'primary',  "$xelatex",   '',            "%T",        $xdv_name,  "%R",   1, [$log_name] ],
+        'dvilualatex'  => [ 'primary',  "$dvilualatex",  '',      "%T",        $dvi_name,  "%R",   1, [$aux_main, $log_name], [$aux_main] ],
+        'latex'     => [ 'primary',  "$latex",     '',            "%T",        $dvi_name,  "%R",   1, [$aux_main, $log_name], [$aux_main] ],
+        'lualatex'  => [ 'primary',  "$lualatex",  '',            "%T",        $pdf_name,  "%R",   1, [$aux_main, $log_name], [$aux_main] ],
+        'pdflatex'  => [ 'primary',  "$pdflatex",  '',            "%T",        $pdf_name,  "%R",   1, [$aux_main, $log_name], [$aux_main] ],
+        'xelatex'   => [ 'primary',  "$xelatex",   '',            "%T",        $xdv_name,  "%R",   1, [$aux_main, $log_name], [$aux_main] ],
         'dvipdf'    => [ 'external', "$dvipdf",    'do_viewfile', $dvi_final,  $pdf_name,  "%Z%R", 1 ],
         'xdvipdfmx' => [ 'external', "$xdvipdfmx", 'do_viewfile', $xdv_final,  $pdf_name,  "%Z%R", 1 ],
         'dvips'     => [ 'external', "$dvips",     'do_viewfile', $dvi_final,  $ps_name,   "%Z%R", 1 ],
@@ -3576,10 +3633,7 @@
     fprint8 $aux_file, "\\gdef \\\@abspage\@last{1}\n";
     close($aux_file);
 
-    if (!$silent) { print "After making new aux file, require run of *latex.\n"; }
     foreach my $rule (keys %possible_primaries ) { 
-        rdb_ensure_file( $rule, $texfile_name );
-        rdb_ensure_file( $rule, $aux_main );
         rdb_one_rule(  $rule,  
                        sub{ $$Pout_of_date = 1; }
                     );
@@ -4235,9 +4289,17 @@
     }
     push @rc_files_read, $rc_file;
 
-    # I could use the do command of perl, but the preceeding -r test
-    # to get good diagnostics gets the wrong result under cygwin
-    # (e.g., on /cygdrive/c/latexmk/LatexMk)
+    # I could use the do function of perl, but:
+    # 1. The preceeding -r test (in an earlier version of latexmk) to get
+    #    good diagnostics gets the wrong result under cygwin (e.g., on
+    #    /cygdrive/c/latexmk/LatexMk).  I forget now (Nov. 2022) what the
+    #    problem was exactly.
+    # 2. The do function searches directories in @INC, which is not wanted
+    #    here, where the aim is to execute code in a specific file in a
+    #    specific directory.  In addition, '.' isn't in the default @INC in
+    #    current versions of Perl (Nov. 2022), so "do latexmkrc;" for
+    #    latexmkrc in cwd fails.
+    # So I'll read the rc file and eval its contents.
     if ( !-e $rc_file ) {
         warn "$My_name: The rc-file '$rc_file' does not exist\n";
         return 1;
@@ -4252,6 +4314,12 @@
         # Read all contents of file into $code:
         { local $/ = undef; $code = <$RCH>;}
         close $RCH;
+        if (! is_valid_utf8($code) ) {
+            die "$My_name: Rc-file '$rc_file' is not in UTF-8 coding. You should save\n",
+                "   it in UTF-8 coding for use with current latexmk.\n";
+        }
+        my $BOM = Encode::encode( 'UTF-8', "\N{U+FEFF}" );
+        $code =~ s/^$BOM//;
         eval $code;
     }
     else {
@@ -4653,8 +4721,8 @@
 #**************************************************
 
 sub check_biber_log {
-    # Check for biber warnings:
-    # Usage: check_biber_log( base_of_biber_run, \@biber_source )
+    # Check for biber warnings, and report source files.
+    # Usage: check_biber_log( base_of_biber_run, \@biber_datasource )
     # return 0: OK;
     #        1: biber warnings;
     #        2: biber errors;
@@ -4664,12 +4732,11 @@
     #        6: missing file, one of which is control file
     #       10: only error is missing \citation commands.
     #       11: Malformed bcf file (normally due to error in pdflatex run)
-    # Side effect: add source files @biber_source
-    # N.B. @biber_source is already initialized by caller to contain
-    #   whatever source files (currently .bcf) it already knows about.
+    # Side effect: add source files @biber_datasource
+    # N.B. @biber_datasource is already initialized by caller.
     #   So do **not** initialize it here.
     my $base = $_[0];
-    my $Pbiber_source = $_[1];
+    my $Pbiber_datasource = $_[1];
     my $blg_name = "$base.blg";
     open( my $blg_file, "<", $blg_name )
       or return 3;
@@ -4747,7 +4814,7 @@
                 # copy of a remote file).
                 # So I have included a condition above that the file must
                 # exist to be included in the source-file list.
-                push @$Pbiber_source, $file;
+                push @$Pbiber_datasource, $file;
             }
         }
         elsif ( /> INFO - WARNINGS: ([\d]+)\s*$/ ) {
@@ -4758,14 +4825,14 @@
         }
     }
     close $blg_file;
-    @$Pbiber_source = uniqs( @$Pbiber_source );
+    @$Pbiber_datasource = uniqs( @$Pbiber_datasource );
     @not_found = uniqs( @not_found );
-    push @$Pbiber_source, @not_found;
+    push @$Pbiber_datasource, @not_found;
 
     if ($control_file_malformed){return 11;} 
 
-    if ( ($#not_found < 0) && ($#$Pbiber_source >= 0) ) {
-        print "$My_name: Found biber source file(s) [@$Pbiber_source]\n"
+    if ( ($#not_found < 0) && ($#$Pbiber_datasource >= 0) ) {
+        print "$My_name: Found biber source file(s) [@$Pbiber_datasource]\n"
         unless $silent;
     }
     elsif ( ($#not_found == 0) && ($not_found[0] =~ /\.bib$/) ) {
@@ -4988,7 +5055,14 @@
     # Note: Only MiKTeX allows out_dir ne aux_dir. It puts
     #       .fls file in out_dir, not aux_dir, which seems
     #       not natural.
-    $fls_name = "%Z%R.fls";
+    if ($fls_uses_out_dir) {
+        $fls_name = "%Z%R.fls";
+        $fls_name_alt = "%Y%R.fls";
+    }
+    else {
+        $fls_name = "%Y%R.fls";
+        $fls_name_alt = "%Z%R.fls";
+    }
     $dvi_name  = "%Z%R.dvi";
     $dviF_name = "%Z%R.dviF";
     $ps_name   = "%Z%R.ps";
@@ -5000,7 +5074,7 @@
     ## puts .xdv file in aux_dir.  So we must use %Y not %Z:
     $xdv_name   = "%Y%R.xdv";
 
-    foreach ( $aux_main, $log_name, $fdb_name, $fls_name,
+    foreach ( $aux_main, $log_name, $fdb_name, $fls_name, $fls_name_alt,
               $dvi_name, $ps_name, $pdf_name, $xdv_name, $dviF_name, $psF_name ) {
         s/%R/$root_filename/g;
         s/%Y/$aux_dir1/;
@@ -5022,25 +5096,165 @@
 
 #**************************************************
 
-sub move_out_files_from_aux {
-    # Move output and fls files to out_dir
-    # Omit 'xdv', that goes to aux_dir (as with MiKTeX). It's not final output.
-    foreach my $ext ( 'fls', 'dvi', 'pdf', 'ps', 'synctex', 'synctex.gz' ) {
-        # Include fls file, because MiKTeX puts it in out_dir, rather than
-        # aux_dir, which would seem more natural.  We must maintain
-        # compatibility.
-        my $from =  "$aux_dir1$root_filename.$ext";
-        my $to = "$out_dir1$root_filename.$ext" ;
-        if ( test_gen_file( $from ) ) {
-            if (! $silent) { print "$My_name: Moving '$from' to '$to'\n"; }
-            my $ret = move( $from, $to );
-            if ( ! $ret ) { die "  That failed, with message '$!'\n";}
+sub correct_aux_out_files {
+    # Deal with situations after a *latex run where files are in different
+    # directories than expected (specifically aux v. output directory).
+    # Do minimal fix ups to allow latexmk to analyze dependencies with log
+    # and fls files in expected places
+    if ( $emulate_aux && ($aux_dir ne $out_dir) ) {
+        # Move output and fls files to out_dir
+        # Omit 'xdv', that goes to aux_dir (as with MiKTeX). It's not final output.
+        foreach my $ext ( 'fls', 'dvi', 'pdf', 'ps', 'synctex', 'synctex.gz' ) {
+            if ( ($ext eq 'fls') && ! $fls_uses_out_dir ) {next;}
+            my $from =  "$aux_dir1$root_filename.$ext";
+            my $to = "$out_dir1$root_filename.$ext" ;
+            if ( test_gen_file( $from ) ) {
+                if (! $silent) { print "$My_name: Moving '$from' to '$to'\n"; }
+                my $ret = move( $from, $to );
+                if ( ! $ret ) { die "  That failed, with message '$!'\n";}
+            }
         }
     }
-}
 
-#***************************************************
+    # Deal with log file in unexpected place (e.g., lack of support by *latex
+    # of -aux-directory option.
+    &find_set_log;
 
+    # Fix ups on fls file:
+    if ($recorder) {
+        # Deal with following special cases:
+        #   1. Some implemenations of *latex give fls files of name latex.fls
+        #      or pdflatex.fls instead of $root_filename.fls.
+        #   2. In some implementations, the writing of the fls file (memory
+        #      of old implementations) may not respect the -output-directory
+        #      and -aux-directory options.
+        #   3. Implementations don't agree on which directory (aux or output)
+        #      the fls is written to.  (E.g., MiKTeX changed its behavior in
+        #      Oct 2020.)
+        #   4. Some implementations (TeXLive) don't use -aux-directory.
+        # Situation on implementations, when $emulate_aux is off:
+        #   TeXLive: implements -output-directory only, and gives a non-fatal
+        #      warning for -aux-directory. Symptoms:
+        #         .log, .fls, .aux files written to intended output directory.
+        #         .log file reports TeXLive implementation
+        #     Correct reaction: Turn $emulate_aux on and rerun *latex.  The
+        #         variety of files that can be written by packages is too
+        #         wide to allow simple prescription of a fix up.
+        #  MiKTeX: Pre-Oct-2020: fls file written to out dir.
+        #          Post-Oct-2020: fls file written to aux dir.
+        #  Other names:
+        #  Some older versions wrote pdflatex.fls or latex.fls
+        #  Current TeXLive: the fls file is initially written with the name
+        #    <program name><process number>.fls, and then changed to the
+        #   correct name.  Under some error conditions, the change of name
+        #   does not happen.
+
+        my $std_fls_file = $fls_name;
+        my @other_fls_names = ( );
+        if ( $rule =~ /^pdflatex/ ) {
+            push @other_fls_names, "pdflatex.fls";
+        }
+        else {
+            push @other_fls_names, "latex.fls";
+        }
+        if ( $aux_dir1 ne '' ) {
+            push @other_fls_names, "$root_filename.fls";
+            # The fls file may be in the opposite directory to the
+            # one configured by $fls_uses_out_dir:
+            push @other_fls_names, $fls_name_alt;
+        }
+        # Find the first non-standard fls file and copy it to the standard
+        # place. But only do this if the file time is compatible with being
+        # generated in the current run, and if the standard fls file hasn't
+        # been made in the current run,  as tested by the use of
+        # test_gen_file; that avoids problems with fls files left over from
+        # earlier runs with other versions of latex.
+        if ( ! test_gen_file( $std_fls_file ) ) {
+            foreach my $cand (@other_fls_names) {
+                if ( test_gen_file( $cand ) ) {
+                    print "$My_name: Copying '$cand' to '$std_fls_file'.\n";
+                    copy $cand, $std_fls_file;
+                    last;
+                }
+            }
+        }
+        if ( ! test_gen_file( $std_fls_file ) ) {
+            warn "$My_name: fls file doesn't appear to have been made.\n";
+        }
+    }
+} # END correct_aux_out_files
+
+#-----------------
+
+sub find_set_log {
+    # Locate the log file, generated on this run.
+    # It should be in aux_dir. But:
+    #  1. With a sufficiently severe error in *latex, no log file was generated.
+    #  2. With aux_dir ne out_dir and emulate_aux off and a (TeXLive) *latex
+    #     that doesn't support aux_dir, the log file is in out_dir.
+    #  3. If the specified command has no %O or if *latex doesn't support
+    #     out_dir (hence not TeXLive and not MiKTeX), the log file would
+    #     be in cwd.
+    #
+    #  3 is fatal error.
+    #  2 is handled by turning emulate_aux on, after which next run of *latex
+    #    handles problem.
+    #  1 is like any other error.
+    #  4 is treated like 1 (log file not found).
+    #
+    # Returns 
+    #    0 log file not found;
+    #    1 log file in aux_dir i.e., correct place;
+    #    2 log file **not** in aux_dir but in out_dir,
+    #      emulate_aux turned on, commands fixed,
+    #      and log file copied to aux_dir
+    # If the log file is found in cwd, report it and give fatal error.
+    
+    my $where_log = -1; # Nothing analyzed yet
+
+    if ( test_gen_file( "$aux_dir1$root_filename.log" ) ) {
+        # .log file is in expected place.
+        $where_log = 1;
+    }
+    elsif ( (! $emulate_aux) && test_gen_file( "$out_dir1$root_filename.log" ) ) {
+        warn "$My_name: .log file in '$out_dir' instead of expected '$aux_dir'\n",
+             "   But emulate_aux is off.  So I'll turn it on.\n",
+             "   I'll copy the log file to the correct place.\n",
+             "   The next run of *latex **SHOULD** not have this problem.\n";
+        copy( "$out_dir1$root_filename.log", "$aux_dir1$root_filename.log" );
+        $where_log = 2;
+        $emulate_aux = 1;
+        $emulate_aux_switched = 1;
+        # Fix up commands to have fudged use of directories for
+        # use with non-aux-dir-supported *latex engines.
+        foreach ( $$Pext_cmd ) {
+            s/ -output-directory=[^ ]*(?= )//g;
+            s/ -aux(-directory=[^ ]*)(?= )/ -output$1/g;
+        }
+    }
+    elsif ( test_gen_file( "$root_filename.log" ) ) {
+        # .log file is not in out_dir nor in aux_dir, but is in cwd.
+        # Presumably there is a configuration error
+        # that prevents the directories from being used by latex.
+        die "$My_name: The log file found was '$root_filename.log' instead of\n",
+            "  '$aux_dir1$root_filename.log'.  Probably a configuration error\n",
+            "  prevented the use of the -aux-directory and/or the -output-directory\n",
+            "  options with the *latex command.\n",
+            "  I'll stop.\n";
+    }
+    else {
+        # No .log file found
+        $failure = 1;
+        $$Plast_result = 2;
+        $where_log = 0;
+        $failure_msg 
+            = "*LaTeX didn't generate the expected log file '$log_name'\n";
+    }
+    return $where_log;
+} #END find_set_log
+
+#************************************************************
+
 sub parse_log {
 # Use: parse_log( log_file_name,
 #                 ref to array containing lines,
@@ -5872,75 +6086,6 @@
 
 #=====================================
 
-sub find_set_log {
-    # Locate the log file, generated on this run.
-    # It should be in aux_dir. But:
-    #  1. With a sufficiently severe error in *latex, no log file was generated.
-    #  2. With aux_dir ne out_dir and emulate_aux off and a (TeXLive) *latex
-    #     that doesn't support aux_dir, the log file is in out_dir.
-    #  3. If the specified command has no %O or if *latex doesn't support
-    #     out_dir (hence not TeXLive and not MiKTeX), the log file would
-    #     be in cwd.
-    #
-    #  3 is fatal error.
-    #  2 is handled by turning emulate_aux on, after which next run of *latex
-    #    handles problem.
-    #  1 is like any other error.
-    #  4 is treated like 1 (log file not found).
-    #
-    # Returns 
-    #    0 log file not found;
-    #    1 log file in aux_dir i.e., correct place;
-    #    2 log file **not** in aux_dir but in out_dir,
-    #      emulate_aux turned on, commands fixed,
-    #      and log file copied to aux_dir
-    # If the log file is found in cwd, report it and give fatal error.
-    
-    my $where_log = -1; # Nothing analyzed yet
-
-    if ( test_gen_file( "$aux_dir1$root_filename.log" ) ) {
-        # .log file is in expected place.
-        $where_log = 1;
-    }
-    elsif ( (! $emulate_aux) && test_gen_file( "$out_dir1$root_filename.log" ) ) {
-        warn "$My_name: .log file in '$out_dir' instead of expected '$aux_dir'\n",
-             "   But emulate_aux is off.  So I'll turn it on.\n",
-             "   I'll copy the log file to the correct place.\n",
-             "   The next run of *latex **SHOULD** not have this problem.\n";
-        copy( "$out_dir1$root_filename.log", "$aux_dir1$root_filename.log" );
-        $where_log = 2;
-        $emulate_aux = 1;
-        $emulate_aux_switched = 1;
-        # Fix up commands to have fudged use of directories for
-        # use with non-aux-dir-supported *latex engines.
-        foreach ( $$Pext_cmd ) {
-            s/ -output-directory=[^ ]*(?= )//g;
-            s/ -aux(-directory=[^ ]*)(?= )/ -output$1/g;
-        }
-    }
-    elsif ( test_gen_file( "$root_filename.log" ) ) {
-        # .log file is not in out_dir nor in aux_dir, but is in cwd.
-        # Presumably there is a configuration error
-        # that prevents the directories from being used by latex.
-        die "$My_name: The log file found was '$root_filename.log' instead of\n",
-            "  '$aux_dir1$root_filename.log'.  Probably a configuration error\n",
-            "  prevented the use of the -aux-directory and/or the -output-directory\n",
-            "  options with the *latex command.\n",
-            "  I'll stop.\n";
-    }
-    else {
-        # No .log file found
-        $failure = 1;
-        $$Plast_result = 2;
-        $where_log = 0;
-        $failure_msg 
-            = "*LaTeX didn't generate the expected log file '$log_name'\n";
-    }
-    return $where_log;
-} #END find_set_log
-
-#************************************************************
-
 sub parse_fls {
     my $start_time = processing_time();  
     my ($fls_name, $Pinputs, $Poutputs, $Pfirst_read_after_write, $Ppwd_latex ) = @_;
@@ -6044,31 +6189,44 @@
             if ( (exists $$Poutputs{$file}) && (! exists $$Pinputs{$file}) ) {
                 $$Pfirst_read_after_write{$file} = 1;
             }
-            # Take precautions against main destination file being listed as INPUT file
-            # This results, e.g., from hyperxmp (2020/10/05 v. 5.6) reading the pdf file
-            # size, and triggers an infinite loop, unless we omit the pdf file from the 
-            # list of input files.  (Hyperxmp v. 5.7 2010/11/01 doesn't give this problem.)
-            # There's a related issue with the log file, when acmart.cls is used with
-            # xelatex.  (I don't work out what causes this, e.g., what package.)
-            # Test on basenames rather than full name to evade in a simple-minded way
-            # alias issues with the directory part.
+            # Take precautions when the main destination file (or pdf file) or the log
+            # file are listed as INPUT files in the .fls file.
+            # At present, the known cases are caused by hyperxmp, which reads file metadata
+            # for certain purposes (e.g., setting a current date and time, or finding the
+            # pdf file size).  These uses are legitimate, but the files should not be
+            # treated as genuine source files for *latex.
+            # Note that both the pdf and log files have in their contents strings for
+            # time and date, so in general their contents don't stabilize between runs
+            # of *latex.  Hence adding them to the list of source files on the basis of
+            # their appearance in the list of input files in the .fls file would cause
+            # an incorrect infinite loop in the reruns of *latex.
+            #
+            # Older versions of hyperxmp (e.g., 2020/10/05 v. 5.6) reported the pdf file
+            # as an input file.
+            # The current version when used with xelatex reports the .log file as an
+            # input file. 
+            #
+            # The test for finding the relevant .pdf (or .dvi ...) and .log files is
+            # on basenames rather than full name to evade in a simple-minded way
+            # alias issues with the directory part:
             if ( basename($file) eq $pdf_base ) {
                 warn "$My_name: !!!!!!!!!!! Fls file lists main pdf **output** file as an input\n",
-                     "   file for rule '$rule'. I won't treat as a source file, since that leads\n",
-                     "   to an infinite loop.\n",
-                    "    This can be caused by the hyperxmp package in an old version.\n",
-                    "    You should update to hyperxmp in ver. 5.7 or higher\n";
+                     "   file for rule '$rule'. I won't treat as a source file, since that can\n",
+                     "   lead to an infinite loop.\n",
+                     "   This situation can be caused by the hyperxmp package in an old version,\n",
+                     "   in which case you can ignore this message.\n";
             } elsif ( basename($file) eq $out_base ) {
                 warn "$My_name: !!!!!!!!!!! Fls file lists main **output** file as an input\n",
-                     "   file for rule '$rule'. I won't treat as a source file, since that leads\n",
-                     "   to an infinite loop.\n",
-                    "    This can be caused by the hyperxmp package in an old version.\n",
-                    "    You should update to hyperxmp in ver. 5.7 or higher\n";
+                     "   file for rule '$rule'. I won't treat as a source file, since that can\n",
+                     "   lead to an infinite loop.\n",
+                     "   This situation can be caused by the hyperxmp package in an old version,\n",
+                     "   in which case you can ignore this message.\n";
             } elsif ( basename($file) eq $log_base ) {
-                warn "$My_name: !!!!!!!!!!! Fls file lists log file as an input\n",
-                     "   file for rule '$rule'. I won't treat it as a source file, since\n",
-                    "   there appear to be no good uses for it.\n",
-                    "   This behavior happens at least under acmart.cls with xelatex\n";
+                warn "$My_name: !!!!!!!!!!! Fls file lists log file as an input file for\n",
+                     "   rule '$rule'. I won't treat it as a source file.\n",
+                     "   This situation can occur when the hyperxmp package is used with\n",
+                     "   xelatex; the package reads the .log file's metadata to set current\n",
+                     "   date and time.  In this case you can safely ignore this message.\n";
             } else {
                 $$Pinputs{$file} = 1;
             }
@@ -6298,15 +6456,15 @@
     return 1;
 } #END parse_aux
 
-
-
 #************************************************************
 
 sub parse_aux1
 # Parse single aux file for bib files.  
 # Usage: &parse_aux1( aux_file_name )
-#   Append newly found bib_filenames in @$Pbib_files, already 
+#   Append newly found names of .bib files to %bib_files, already
 #        initialized/in use.
+#   Append newly found names of .bst files to %bst_files, already
+#        initialized/in use.
 #   Append aux_file_name to @$Paux_files if aux file opened
 #   Recursively check \@input aux files
 #   Return 1 if success in opening $aux_file_name and parsing it
@@ -6365,6 +6523,70 @@
 
 #************************************************************
 
+sub parse_bcf {
+    # Parse bcf file for bib and other source files.  
+    # Usage: parse_bcf( $bcf_file, \@new_bib_files )
+    # If can't open bcf file, then
+    #    Return 0 and leave @new_bib_files empty
+    # Else set @new_bib_files from information in the
+    #       bcf files 
+    #    And:
+    #    Return 1 if no problems
+    #    Return 2 with @new_bib_files empty if there are no relevant source
+    #      file lines.
+    #    Return 3 if I couldn't locate all the bib_files
+    # A full parse of .bcf file as XML would need an XML parsing module, which
+    # is not in a default installation of Perl, notably in TeXLive's perl for
+    # Win32 platform.  To avoid requiring the installation, just search the
+    # .bcf file for the relevant lines.
+
+    my $bcf_file = $_[0];
+    my $Pbib_files = $_[1];
+    # Default return value
+    @$Pbib_files = ();
+    # Map file specs (from datasource lines) to actual filenames:
+    local %bib_files = ();
+    my @not_found_bib = ();
+
+    open(my $bcf_fh, $bcf_file)
+    || do {
+       warn "$My_name: Couldn't find bcf file '$bcf_file'\n";
+       return 0; 
+    };
+    while ( <$bcf_fh> ) {
+        $_ = utf8_to_mine($_);
+        if ( /^\s*<bcf:datasource type=\"file\"\s+datatype=\"bibtex\"\s+glob=\"false\">(.+)<\/bcf:datasource>/ ) {
+            $bib_files{$1} = '';
+        }
+    }
+    close $bcf_fh;
+
+    find_files( \%bib_files, 'bib', 'bib', $Pbib_files, \@not_found_bib );
+    if ( $#{$Pbib_files} == -1 ) {
+        # 
+        print "$My_name: No .bib files listed in .bcf file '$bcf_file'\n";
+        return 2;
+    }
+
+    show_array( "$My_name: Bibliography file(s) form .bcf file:", @$Pbib_files )
+        unless $silent;
+    if (@not_found_bib) {
+        show_array(
+            "Bib file(s) not found in search path:",
+            @not_found_bib );
+    }
+    if (@not_found_bib) {
+        if ($force_mode) {
+            warn "$My_name: Failed to find one or more bibliography files in search path.\n";
+            warn "====BUT force_mode is on, so I will continue. There may be problems ===\n";
+        }
+        return 3;
+    }
+    return 1;
+
+} #END parse_bcf
+
+
 #************************************************************
 #************************************************************
 #************************************************************
@@ -7204,33 +7426,35 @@
         my @new_bib_files = ();
         my @new_aux_files = ();
         my @new_bst_files = ();
-        my @biber_source = ( "$bbl_base.bcf" );
+        my $bcf_file =  "$bbl_base.bcf";
         my $bib_program = 'bibtex';
-        if ( test_gen_file( "$bbl_base.bcf" ) ) {
-             $bib_program = 'biber';
+        if ( test_gen_file( $bcf_file ) ) {
+            $bib_program = 'biber';
         }
         my $from_rule = "$bib_program $bbl_base";
         print "=======  Dealing with '$from_rule'\n" if ($diagnostics);
         # Don't change to use activation and deactivation here, rather than
         # creation and removal of rules.  This is because rules are to be
-        # created on the fly here with details corresponding to current. So
-        # activating a previously inactive rule, which is out-of-date, may
-        # cause trouble.
+        # created on the fly here with details corresponding to current state
+        # of .tex source file(s). So activating a previously inactive rule,
+        # which is out-of-date, may cause trouble.
         if ($bib_program eq 'biber') {
-            check_biber_log( $bbl_base, \@biber_source );
             # Remove OPPOSITE kind of bbl generation:
             rdb_remove_rule( "bibtex $bbl_base" );
+
+            parse_bcf( $bcf_file, \@new_bib_files );
         }
         else {
-            parse_aux( "$bbl_base.aux", \@new_bib_files, \@new_aux_files, \@new_bst_files );
             # Remove OPPOSITE kind of bbl generation:
             rdb_remove_rule( "biber $bbl_base" );
+            
+            parse_aux( "$bbl_base.aux", \@new_bib_files, \@new_aux_files, \@new_bst_files );
         }
         if ( ! rdb_rule_exists( $from_rule ) ){
             print "   ===Creating rule '$from_rule'\n" if ($diagnostics);
             if ( $bib_program eq 'biber' ) {
                 rdb_create_rule( $from_rule, 'external', $biber, '', 1,
-                                 "$bbl_base.bcf", $bbl_file, $bbl_base, 1, 0, 0, 1, [ "$bbl_base.blg" ]  );
+                                 $bcf_file, $bbl_file, $bbl_base, 1, 0, 0, 1, [ "$bbl_base.blg" ]  );
             }
             else {
                 rdb_create_rule( $from_rule, 'external', $bibtex, 'run_bibtex', 1,
@@ -7242,7 +7466,7 @@
         rdb_one_rule( $from_rule, sub { %old_sources = %$PHsource; } );
         my @new_sources = ( @new_bib_files, @new_aux_files, @new_bst_files );
         if ( $bib_program eq 'biber' ) {
-            push @new_sources, @biber_source;
+            push @new_sources, $bcf_file;
         }
         foreach my $source ( @new_sources ) {
             print "  ===Source file '$source' for '$from_rule'\n"
@@ -7468,10 +7692,12 @@
     #    and for those TeX engines (not MiKTeX) that put \openout lines in log
     #    file.
     # b. By the file existing and being at least as new as the system
-    #    time at the start of the run. 
+    #    time at the start of the run.  But make an allowance ($filetime_slop) for
+    #    differences in granularity between reported system time and reported
+    #    file mtimes.
     my $file = shift;
     return exists $generated_log{$file} || $generated_fls{$file}
-           || ( -e $file && ( get_mtime( $file ) >= $$Prun_time));
+           || ( -e $file && ( get_mtime( $file ) >= $$Prun_time - $filetime_slop ));
 }
 
 #************************************************************
@@ -8393,16 +8619,12 @@
         if ($bibtex_use == 0) {
            $bibtex_not_run = 2;
         }
-        else {
-            if ( $rule =~ /^biber/ ) {
-                warn "$My_name: ???!!!==== Using biber OMITTING TEST on missing bib files\n";
-            }
-            elsif ( ($bibtex_use == 1) || ($bibtex_use == 1.5) ) {
-                foreach ( keys %$PHsource ) {
-                    if ( ( /\.bib$/ ) && (! -e $_) ) {
-                        push @missing_bib_files, $_;
-                        $bibtex_not_run = 1;
-                    }
+        elsif ( ($bibtex_use == 1) || ($bibtex_use == 1.5) ) {
+            # Conditional run of bibtex (or biber) depending on existence of .bib file.
+            foreach ( keys %$PHsource ) {
+                if ( ( /\.bib$/ ) && (! -e $_) ) {
+                    push @missing_bib_files, $_;
+                    $bibtex_not_run = 1;
                 }
             }
         }
@@ -8579,7 +8801,7 @@
 
     if ($latex_like) { run_hooks( 'before_xlatex' ); }
 
-    my $time = processing_time();
+    my $time_start = processing_time();
    
     if ($int_cmd) {
         print "For rule '$rule', use internal command '\&$int_cmd( @int_args_for_printing )' ...\n"
@@ -8597,8 +8819,7 @@
         $$Plast_result = 2;
         $$Plast_message = "Bug or configuration error; incorrect command type";
     }
-    $time = processing_time() - $time;
-    add_timing( $time, $rule );
+    add_timing( processing_time() - $time_start, $rule );
 
 #============================================================================
 
@@ -8611,17 +8832,15 @@
     #
     $$Pout_of_date = $$Pout_of_date_user = 0;
     if ($latex_like) {
-        if ( $emulate_aux && ($aux_dir ne $out_dir) ) {
-            &move_out_files_from_aux;
-        }
+        &correct_aux_out_files;
         run_hooks( 'after_xlatex' );
         $return = analyze_latex_run( $return );
         run_hooks( 'after_xlatex_analysis' );
     }
     elsif ( $rule =~ /^biber/ ) {
-        my @biber_source = ( );
-        my $retcode = check_biber_log( $$Pbase, \@biber_source );
-        foreach my $source ( @biber_source ) {
+        my @biber_datasource = ( );
+        my $retcode = check_biber_log( $$Pbase, \@biber_datasource );
+        foreach my $source ( @biber_datasource ) {
 #           if ( $source =~ /\"/ ) {next; }
             print "  ===Source file '$source' for '$rule'\n"
                if ($diagnostics);
@@ -8681,16 +8900,6 @@
             unlink $$Pdest;
             # The missing bbl file is now not an error:
             $return = -2;
-# ??????? BCF
-# Following is intended to work, but creates infinite loop
-# in malformed bcf file situation under -pvc.
-# since on each check for change in ANY file, pvc finds changed file
-# Need to restrict pvc reruns to case of changed USER files
-#           # To give good properties for *latex rule, it is best
-#           # to have a valid bbl file that exists:
-#           create_empty_file( $$Pdest );
-#            $return = 0;
-            
         }
     }
     elsif ( $rule =~ /^bibtex/ ) {
@@ -8860,8 +9069,6 @@
     return $return;
 } #END Run_subst
 
-#-----------------
-
 sub analyze_latex_run {
     # Call: analyze_latex_run(old_ret_code)
     # Analyze results of run of *latex (or whatever was run instead) from
@@ -8885,56 +9092,12 @@
     # Need to worry about changed directory, changed output extension
     # Where else is $missing_dvi_pdf set?  Was it initialized?
     if (-e $$Pdest) { $missing_dvi_pdf = '';}
-
-    # Handle case that log file is caused to be in an unexpected place,
-    #   from a configuration error:
-    &find_set_log;
     
-    if ($recorder) {
-        # Handle problem that some version of *latex give fls files
-        #    of name latex.fls or pdflatex.fls instead of $root_filename.fls.
-        # Also that setting of -output-directory -aux-directory is not 
-        #    respected by *latex, at least in some versions.
-
-        my $std_fls_file = $fls_name;
-        my @other_fls_names = ( );
-        if ( $rule =~ /^pdflatex/ ) {
-            push @other_fls_names, "pdflatex.fls";
-        }
-        else {
-            push @other_fls_names, "latex.fls";
-        }
-        if ( $aux_dir1 ne '' ) {
-            push @other_fls_names, "$root_filename.fls";
-            # MiKTeX uses out_dir for .fls. However, it seems logical to
-            # me for .fls to be in aux_dir.  So I'll allow for this
-            # Possibility, although I don't know if it has been used.
-            push @other_fls_names, "$aux_dir1$root_filename.fls";
-        }
-        # Find the first non-standard fls file and copy it to the standard
-        # place. But only do this if the file time is compatible with being
-        # generated in the current run, and if the standard fls file hasn't
-        # been made in the current run,  as tested by the use of
-        # test_gen_file; that avoids problems with fls files leftover from
-        # earlier runs with other versions of latex.
-        if ( ! test_gen_file( $std_fls_file ) ) {
-            foreach my $cand (@other_fls_names) {
-                if ( test_gen_file( $cand ) ) {
-                    copy $cand, $std_fls_file;
-                    last;
-                }
-            }
-        }
-        if ( ! test_gen_file( $std_fls_file ) ) {
-            warn "$My_name: fls file doesn't appear to have been made.\n";
-        }
-    }
-
     # Find current set of source files:
     my ($missing_dirs, $PA_missing_subdirs, $bad_warnings) = &rdb_set_latex_deps;
     if ($bad_warning_is_error && $bad_warnings) {
         warn "$My_name: Serious warnings in .log configured to be errors\n";
-        $return ||= $bad_warnings;
+        $return ||= $bad_warnings;1
     }
 
     # For each file of the kind made by epstopdf.sty during a run, 
@@ -9303,46 +9466,7 @@
 
 #************************************************************
 
-#sub rdb_diagnose_changes {
-#    # ???!!! delete after using ideas in rdb_diagnose_changes2
-#    # Call: rdb_diagnose_changes or rdb_diagnose_changes( heading, show_out_of_date_rules )
-#    # Precede the message by the optional heading, else by "$My_name: " 
-#    my ($heading, $show_out_of_date_rules) = @_;
-#    our ( @changed, %changed_rules, @disappeared, @no_dest, @rules_to_apply,
-#          @rules_never_run );
-#    
-#    if ($#rules_never_run >= 0) {
-#        show_array( "${heading}Rules & subrules not known to be previously run:", @rules_never_run );
-#    }
-#    if ( ($#changed >= 0) || (keys %changed_rules > 0) || ($#disappeared >= 0) || ($#no_dest >= 0) ) {
-#        print "${heading}File changes, etc:\n";
-#        if ( $#changed >= 0 ) {
-#            # ???!!! Modify to allow for case of 
-#            show_array( " Changed files, or newly in use/created since previous run(s):", uniqs(@changed) );
-#        }
-#        if ( $#disappeared >= 0 ) {
-#            show_array( " No-longer-existing files:", uniqs(@disappeared) );
-#        }
-#        if ( $#no_dest >= 0 ) {
-#            show_array( " Non-existent destination for:", uniqs(@no_dest) );
-#        }
-#        if ( keys %changed_rules > 0 ) {
-#            print "  Rule(s) that have been run and require run of dependent rule:\n";
-#            while (my ($s_rule, $d_rule) = each %changed_rules) {
-#                print "      '$s_rule' which requires run of '$d_rule'\n";
-#            }
-#        }
-#    }
-#    if ($show_out_of_date_rules) {
-#        show_array( "${heading}Overall, the following rules became out-of-date:",
-#                    uniqs(@rules_to_apply));
-#    }
-#}  #END rdb_diagnose_changes
-
-#----------------------------
-
 sub rdb_diagnose_changes2 {
-    # ???!!! Examine rdb_diagnose_changes for ideas in old version to use here.
     # Call: rdb_diagnose_changes2( \%changes, heading, show_out_of_date_rules )
 
     my ($PHchanges, $heading, $show_out_of_date_rules) = @_;
@@ -9710,31 +9834,35 @@
     # rdb_create_rule( rule, command_type, ext_cmd, int_cmd, DUMMY,
     #                  source, dest, base, 
     #                  needs_making, run_time, check_time, set_file_not_exists,
-    #                  ref_to_array_of_specs_of_extra_generated_files )
+    #                  ref_to_array_of_specs_of_extra_generated_files,
+    #                  ref_to_array_of_specs_of_extra_source_files )
     # int_cmd is either a string naming a perl subroutine or it is a
     # reference to an array containing the subroutine name and its
     # arguments. 
     # Makes rule.  Update rule if it already exists.
-    # Omitted arguments: replaced by 0 or '' as needed.
+    # Omitted arguments: replaced by 0, '', or [] as needed.
     # Rule is made active
 # ==== Sets rule data ====
     my ( $rule, $cmd_type, $ext_cmd, $PAint_cmd, $DUMMY, 
          $source, $dest, $base, 
          $needs_making, $run_time, $check_time, $set_file_not_exists,
-         $extra_gen ) = @_;
+         $PAextra_gen, $PAextra_source ) = @_;
+    # Set defaults for undefined arguments
     foreach ( $needs_making, $run_time, $check_time, $DUMMY ) {
         if (! defined $_) { $_ = 0; }
     }
+    foreach ( $cmd_type, $ext_cmd, $PAint_cmd, $source, $dest, $base, 
+              $set_file_not_exists ) {
+        if (! defined $_) { $_ = ''; }
+    }
+    foreach ( $PAextra_gen, $PAextra_source ) {
+        if (! defined $_) { $_ = []; }
+    }
     my $last_result = -1;
     my $no_history = ($run_time <= 0);
     my $active = 1;
     my $changed = 0;
 
-    # Set defaults, and normalize parameters:
-    foreach ( $cmd_type, $ext_cmd, $PAint_cmd, $source, $dest, $base, 
-              $set_file_not_exists ) {
-        if (! defined $_) { $_ = ''; }
-    }
     if ( ($source =~ /\"/) || ($dest =~ /\"/) || ($base =~ /\"/) ) {
         die "$My_name: Error. In rdb_create_rule to create rule\n",
             "    '$rule',\n",
@@ -9752,22 +9880,18 @@
         # COPY the referenced array:
         $PAint_cmd = [ @$PAint_cmd ];
     }
-    my $PA_extra_gen = [];
-    if ($extra_gen) {
-        @$PA_extra_gen = @$extra_gen;
-    }
     $rule_db{$rule} = 
         [  [$cmd_type, $ext_cmd, $PAint_cmd, $no_history, 
             $source, $dest, $base,
             $needs_making, 0, $run_time, $check_time, $changed,
-            $last_result, '', $PA_extra_gen ],
+            $last_result, '', $PAextra_gen ],
            {},
            {},
            {},
            {}
         ];
-    if ($source) {
-       rdb_ensure_file( $rule, $source, undef, $set_file_not_exists );  
+    foreach my $file ($source, @$PAextra_source ) {
+        if ($file) { rdb_ensure_file( $rule, $file, undef, $set_file_not_exists ); }
     }
     rdb_one_rule( $rule, \&rdb_initialize_generated );
     if ($active) { rdb_activate($rule); }
@@ -9831,10 +9955,13 @@
     #    (a) by default initialize it to current file state.
     #    (b) but if the fourth argument, set_not_exists, is true, 
     #        initialize the item as if the file does not exist.
-    #        This case is typically used when the log file for a run
-    #        of latex/pdflatex claims that the file was non-existent
-    #        at the beginning of a run. 
-#============ rule and file data set here ======================================
+    #        This case is typically used
+    #         (1) when the log file for a run of latex/pdflatex claims
+    #             that the file was non-existent at the beginning of a
+    #             run.
+    #         (2) When initializing rules, when there is no previous
+    #             known run under the control of latexmk.
+#============ NOTE: rule and file data set here ===============================
     my $rule = shift;
     local ( $new_file, $new_from_rule, $set_not_exists ) = @_;
     if ( ! rdb_rule_exists( $rule ) ) {
@@ -10290,9 +10417,18 @@
 
 #************************************************************
 
-sub processing_time
-{  my ($user, $system, $cuser, $csystem) = times();
-   return $user + $system + $cuser + $csystem;
+sub processing_time {
+    # Return time used.
+    # Either total processing time of process and child processes as reported
+    # in pieces by times(), or HiRes time since Epoch depending on setting of
+    # $times_are_clock.
+    # That variable is to be set on OSs (MSWin32) where times() does not
+    # include time for subprocesses.
+    if ($times_are_clock) {
+        return Time::HiRes::time();
+    }
+    my ($user, $system, $cuser, $csystem) = times();
+    return $user + $system + $cuser + $csystem;
 }
 
 #************************************************************

Modified: trunk/Master/texmf-dist/doc/man/man1/latexmk.1
===================================================================
--- trunk/Master/texmf-dist/doc/man/man1/latexmk.1	2023-01-07 21:22:46 UTC (rev 65482)
+++ trunk/Master/texmf-dist/doc/man/man1/latexmk.1	2023-01-07 21:23:15 UTC (rev 65483)
@@ -1,4 +1,4 @@
-.TH LATEXMK 1 "18 November 2022" ""
+.TH LATEXMK 1 "7 January 2023" ""
 .SH NAME
 latexmk \- generate LaTeX document
 .SH SYNOPSIS
@@ -173,20 +173,21 @@
 .TP
 .B -auxdir=FOO \fRor\fB -aux-directory=FOO
 Sets the directory for auxiliary output files of *latex (.aux, .log etc).
-See the description of the \fI$aux_dir\fR variable, the
-\fB-emulate-aux-dir\fR, and the \fI$emulate_aux\fR variables for some
-complications in using this option with the TeX Live distribution.
+These are all the generated files, with the exception of final output files
+(.dvi, .ps, .pdf, .synctex.gz, .synctex).  See the
+\fB-outdir\fR/\fB-output-directory\fR option for directories for the final
+output files. 
 
-See also the \fB-outdir\fR/\fB-output-directory\fR options, and the
-\fI$aux_dir\fR, \fI$out_dir\fR, and \fI$search_path_separator\fR
-configuration variables of \fIlatexmk\fR.  In particular, see the
-documentation of \fI$out_dir\fR for some complications on what
-directory names are suitable.
+If the directory specified for the \fB-aux\fR/\fB-aux-directory\fR option
+is blank, then the default is used, which is to be the same as the output
+directory. 
 
 If you also use the \fB-cd\fR option, and the specified auxiliary output
 directory is a relative path, then the path is interpreted relative to
 the document directory.
 
+See the section AUXILIARY AND OUTPUT DIRECTORIES for more details.
+
 .TP
 .B -bibtex 
 When the source file uses bbl files for bibliography, run bibtex or
@@ -542,19 +543,19 @@
 
 .TP
 .B -emulate-aux-dir
-Emulate -aux-directory instead of leaving it to the *latex programs
-to do it.  (MiKTeX supports -aux-directory, but TeXLive doesn't.)
+Emulate the use of an aux directory instead of leaving it to the *latex
+programs to do it.  (MiKTeX supports -aux-directory, but TeXLive doesn't.)
 
-For more details see the explanation for the configuration variable
-\fI$emulate_aux\fR. 
+See the section AUXILIARY AND OUTPUT DIRECTORIES for more details.
 
 .TP
 .B -emulate-aux-dir-
-Turn off emulatation -aux-directory and leave it to the *latex program
-to handle the case that aux_dir is not equal to out_dir.  Note that if you
-use TeXLive, which doesn't support -aux-directory, latexmk will
-automatically switch aux_dir emulation on after the first run of *latex,
-because it will find the .log file in the wrong place.
+Turn off emulation to implement an aux directory and leave it to the *latex
+program to handle the case that the aux directory is different from the
+output directory.  Note that if you use TeXLive, which doesn't support
+-aux-directory, latexmk will automatically switch aux_dir emulation on
+after the first run of *latex, because it will find the .log file in the
+wrong place.
 
 .TP
 .B -f
@@ -811,22 +812,18 @@
 .TP
 .B -outdir=FOO \fRor\fB -output-directory=FOO
 
-Sets the directory for the output files of *latex.  This achieves
-its effect by the \fB-output-directory\fR option of *latex, which
-currently (Dec. 2011 and later) is implemented on the common versions of
-*latex, i.e., MiKTeX and TeXLive.  It may not be present in other
-versions. 
+Sets the directory for the output files of *latex.
 
-See also the \fB-auxdir\fR/\fB-aux-directory\fR options, and the
-\fI$aux_dir\fR, \fI$out_dir\fR, and \fI$search_path_separator\fR
-configuration variables of \fIlatexmk\fR.  In particular, see the
-documentation of \fI$out_dir\fR for some complications on what
-directory names are suitable.
+If the aux directory is not set or is the same as the output directory,
+then all output files of *latex are sent to the output directory.
 
-If you also use the \fB-cd\fR option, and the specified output
-directory is a relative path, then the path is interpreted relative to
-the document directory.
+If the aux directory is set, e.g., by the option \fB-auxdir\fR, and is not
+equal to the output directory, then only final output files
+(.dvi, .ps, .pdf, .synctex, .synctex.gz) are sent to the output
+directory. Other generated files are sent to the aux directory.
 
+See the section AUXILIARY AND OUTPUT DIRECTORIES for more details.
+
 .TP
 .B -output-format=FORMAT
 This option is one that is allowed for \fIlatex\fR, \fIlualatex\fR, and
@@ -1033,14 +1030,11 @@
 
 .TP
 .B -pv
-Run file previewer.  If the \fB-view\fR option is used, this will select
-the kind of file to be previewed (.dvi, .ps or .pdf).
-Otherwise the viewer views the "highest" kind of file selected, by the
-\fB-dvi\fR, \fB-ps\fR, \fB-pdf\fR, \fB-pdfps\fR options, in the
-order .dvi, .ps, .pdf (low to high).
-If no file type has been selected, the dvi previewer will be used.
-This option is incompatible with the \fB-p\fR and \fB-pvc\fR options,
-so it turns them off.
+Run file previewer.  If the \fB-view\fR option is used, that will select
+the kind of file to be previewed (.pdf, .ps or .dvi).  Otherwise the viewer
+views the "highest" kind of output file that is made, with the ordering
+being .pdf, .ps, .dvi (high to low).  This option is incompatible with the
+\fB-p\fR and \fB-pvc\fR options, so it turns them off.
 
 .TP
 .B -pv-
@@ -1233,12 +1227,13 @@
 
 .TP
 .B -time
-Show CPU time used.
+Show time used.  (On MS Windows, what is shown is clock time; on other
+systems CPU time.)
 See also the configuration variable \fI$show_time\fR.
 
 .TP
 .B -time-
-Do not show CPU time used.
+Do not show time used.
 See also the configuration variable \fI$show_time\fR.
 
 .TP
@@ -1455,6 +1450,182 @@
 of this documentation.
 
 
+.SH AUXILIARY AND OUTPUT DIRECTORIES
+
+Running *latex and the associated programs generate a number of files, it
+is often convenient to arrange for the generated files to be in a different
+directory than the source file(s) of a document.  For our purposes here, we
+identify two classes of generated file.
+
+One class is what one may term the final output files, for example,
+the .pdf file generated by running pdflatex, or the .dvi file from
+latex. Also in this class is the ps file generated by applying dvips to
+a .dvi file. There are also .synctec or .synctex.gz files that can be used
+by programs that display .pdf files and the like to relate positions in
+them to positions in source files.
+
+The second class of file is composed of all other generated files: These
+include notably .aux files that are used for implementing cross referencing,
+and are both generated on one run and read on a later run.  Many packages
+generate yet more such intermediate files, as well as programs like bibtex,
+makeindex, etc.  There are also .log files from *latex and corresponding
+files from other programs.
+
+Let us use the term "output directory" for the directory that receives the
+final output files, and "aux directory" for the directory for the other
+generated files.  If no special options are provided to the *latex
+programs, these directories default to the current directory, and then the
+generated files aren't segregated.  If the two directories are the same, as
+is the simplest situation, then all generated files are written to the same
+directory, and one often simply refers to the output directory, without
+mentioning a separate aux directory.
+
+Support for them is provided for them in the *latex programs: by the single
+option \fB-output-directory\fR for the TeXLive implementations, and by the
+options \fB-aux-directory\fR and \fB-output-directory\fR for the MiKTeX
+implementations.  Special support like this is needed for two reasons:
+First is that there are many packages that write files and it needs to be
+arranged that these are automatically written to the appropriate directory
+without any rewriting of the packages' code.  Second is that the files are
+often read in again on subsequent runs of *latex, and it is necessary that
+the program knows where to find the files.
+
+A complication is that the TeXLive implementation does not allow for
+separate aux and output directories.  Latexmk deals with this by being able
+to emulating a separate aux directory: In this method it invokes *latex
+with just an \fB-output-directory\fR option, with the directory set not to
+the desired output directory, but to the aux directory.  After running
+*latex, it moves the relevant final output file(s) to the intended output
+directory.  Emulation can be turned on by setting the configuration
+variable \fI$emulate_aux\fR to one in a configuration file or by using
+latexmk's \fB-emulate-aux-dir\fR option.  The emulation method works
+equally well if MiKTeX is used.
+
+Latexmk also turns emulation on if it is found to be needed, as follows.
+Suppose emulation is initially off, but the aux and output directories are
+different.  Then latexmk invokes *latex with an -aux-directory option and
+after the run finds that it hasn't been obeyed, notably because the .log
+file is in the output directory rather than the aux directory.  Latexmk
+then sets emulation on, and retries.  Conceivably, it could move all the
+appropriate generated files from the output directory to the aux directory;
+but there is such a large variety of possibilities for these files that
+this is hard to identify all of them reliably except for simple cases. 
+
+Note that the emulation issue only arises when the user has arranged for
+the the aux and output directories to be different.  When instead they are
+equal, e.g., because the user only set the \fI$out_dir\fR variable, then
+latexmk invokes *latex with only an \fB-output-directory\fR option, which
+works as intended with both TeXLive and MiKTeX.
+
+In addition, latexmk arranges the invocations of any auxiliary programs
+like bibtex and makeindex so that they will read and write the relevant
+files from and to the aux directory.  Programs like dvips, dvipdf, ps2pdf,
+and xdvipdfmx are invoked so that they read from the appropriate places and
+write their output to the output directory.
+
+\fIFiles considered as final output files, i.e., those that belong in the
+output directory rather than the aux directory\fR: These have the
+extensions .dvi, .ps., .pdf, .synctex, and .synctex.gz.
+A special case, because of compatibility issues, is of .fls files: See
+below.
+
+Note that xelatex when invoked with its \fB-no-pdf\fR option, as latexmk
+does, generates an .xdv file, which would appear to have the same status as
+a .dvi file generated by latex.  Nevertheless, latexmk treats .xdv as an
+intermediate file that is found in the aux directory.  This is to match
+MiKTeX's treatment of the \fB-aux-directory\fR option.  As further
+justification, one can say that under modern conditions an .xdv file is
+(almost) always an intermediate file.  Historically, the situation
+with .dvi files from latex was different, and currently dvi previewers do
+exist.
+
+
+\fIVariables and options for directories\fR: The variables for setting the
+aux and output directories are \fI$aux_dir\fR and \fI$out_dir\fR, with
+corresponding command line options \fB-auxdir\fR (or \fB-aux-directory\fR)
+and \fB-outdir\fR (or \fB-output-directory\fR).  When a value for these is
+blank (which is the default value), it implies the use of a default: For
+the aux directory, the default is to set it equal to the output directory.
+For the output directory, the default is to be the current directory.
+
+For the turning on and off of the emulation mode, there is the
+configuration variable \fI$emulate_aux\fR and the options
+\fB-emulate-aux-dir\fR, \fB-emulate-aux-dir-\fR, \fB-noemulate-aux-dir\fR.
+
+
+\fIInteraction with -cd option\fR: When the \fB-cd\fR option is used (or
+the equivalent setting of \fI$do_cd\fR variable), then latexmk changes the
+working directory to the document directory before invoking *latex.  If the
+aux and/or output directories are given by relative paths, e.g., by
+\fB-outdir=output\fR for a directory named "output", then the directories
+are relative to the document directory, rather than relative to the working
+directory that was in effect when latexmk was invoked. This matches the
+behavior of *latex as invoked with the provided command line directory
+argument(s) after the change of working directory to the document
+directory.
+
+\fIAutomatic creation of aux and output directories\fR: Unlike *latex, if
+latexmk finds the requested directory/ies don't exist, it creates it/them,
+thereby avoiding errors when *latex is invoked.
+
+If the document uses the \\include macro to read a .tex file from a
+subdirectory, *latex will attempt to write an extra aux file to the
+corresponding subdirectory of the aux directory.  If the subdirectory
+doesn't exist, then *latex will complain that it can't write the aux file.
+After the run of *latex, latexmk detects this situation, creates the
+necessary directory, and reruns *latex with the error situation corrected.
+
+\fIChoice of aux and output directories\fR: Often the aux
+and output directories are given as subdirectories of the document
+directory, e.g., by \fB-outdir=output\fR. But it is possible to provide,
+for example, an absolute path or a path relative to a parent directory,
+e.g., "/tmp/foo" or "../output".  Be aware that in general this can cause
+problems, notably with \fImakeindex\fR or \fIbibtex\fR.  This is because
+modern versions of these programs, by default, will refuse to work when
+they find that they are asked to write to a file in a directory that
+appears not to be the current working directory or one of its
+subdirectories.  This is part of security measures by the whole TeX system
+that try to prevent malicious or errant TeX documents from incorrectly
+messing with a user's files.
+
+By default, latexmk evades this issue: Before running bibtex and makeindex,
+latexmk changes working directory to the aux directory, with appropriate
+settings of search paths.  The use or non-use of this trick is governed by
+the variables \fI$bibtex_fudge\fR and \fI$makeindex_fudge\fR.
+Unfortunately, the trick sometimes makes bibtex and makeindex unable to
+find files.
+
+If necessary the trick can be turned off. But this is incompatible with an
+aux directory like, "/tmp/foo" of "../output").  If you really have to deal
+with this situation, and only if you have to deal with it, then you need to
+disable the security measures (and assume any risks).  One way of doing
+this is to temporarily set an operating system environment variable
+openout_any to "a" (as in "all"), to override the default "paranoid"
+setting.
+
+\fICertain names of aux and output directories not allowed on Microsoft
+Windows\fR: It is natural to want to use the name "aux" for the aux
+directory, e.g., by using the option \fB-auxdir=aux\fR.  But on Microsoft
+operating systems "aux" is one of the names that is not allowed for a file
+or directory.  I find it useful to standardize on a name like "auxdir"
+(e.g., by \fB-auxdir=auxdir\fR); this works independently of operating
+system.
+
+\fILocation of .fls file\fR: Much of the dependency information that
+latexmk uses comes from the .fls file generated when *latex is invoked with
+the \fB-recorder\fR option, which latexmk does by default.  It may seem
+rational that this is written to the aux directory.  But in fact versions
+of MiKTeX prior to Oct. 2020 wrote it to the output directory.  Later
+versions do write it to the aux directory.  To deal with this, latexmk does
+two things: First, if latexmk finds that the .fls file has only been
+generated in the "wrong" directory, then latexmk copies it to the expected
+directory, after which latexmk's operation continues correctly
+independently of the behavior of *latex. Second it allows its idea of the
+"correct" (or expected) directory to be configured by the variable
+\fI$fls_uses_aux_dir\fR.  This defaults to zero, to correspond to MiKTeX's
+current behavior.
+
+
 .SH ALLOWING FOR CHANGE OF OUTPUT FILE TYPE
 
 When one of the latex engines is run, the usual situation is that
@@ -1972,7 +2143,7 @@
 Whether to automatically read the standard initialization (rc) files,
 which are the system RC file, the user's RC file, and the RC file in
 the current directory.  The command line option \fB-norc\fR can be
-used to turn this setting off.  Each RC file could also turn this
+used to turn this setting off.  Each RC file co2uld also turn this
 setting off, i.e., it could set \fI$auto_rc_use\fR to zero to prevent
 automatic reading of the later RC files.
 
@@ -1980,40 +2151,36 @@
 command line by the \fB-r\fR option.
 .TP
 .B $aux_dir [""]
-The directory in which auxiliary files (aux, log, etc) are to be
-written by a run of *latex.  If this variable is not set, but 
-\fI$out_dir\fR is set, then \fI$aux_dir\fR is set to \fI$out_dir\fR,
-which is the directory to which general output files are to be
-written. 
+The aux directory, i.e., the directory in which auxiliary files (aux, log,
+etc) are to be written by a run of *latex.
 
-\fBImportant note\fR:  The default implementation of the aux dir is to give 
-\fI*latex\fR the \fB-aux-directory\fR option.  But that only works with the
-MiKTeX distribution, not with the TeX Live distribution.  Latexmk has an
-alternative implementation that avoids this problem: See the description of 
-\fB-emulate-aux-dir\fR option and the \fI$emulate_aux\fR variable for
-details. 
+If this variable is not set, but \fI$out_dir\fR is set, then latexmk takes
+the aux directory to equal the output directory which is the directory to
+which final output files are to be written.
 
-See also the documentation of \fI$out_dir\fR for some complications on
-what directory names are suitable.
+If neither variable is set, then the current directory when *latex is
+invoked is used both for the aux and output directories.
 
-If you also use the \fB-cd\fR option, and \fI$out_dir\fR (or \fI$aux_dir\fR) contains a
-relative path, then the path is interpreted relative to the document
-directory.
+If the aux and output directories are distinct, then the aux directory
+contains all generated files with the exception of "final output files",
+which are defined to be .dvi, .ps, .pdf, .synctex, and .synctex.gz files.
 
+See the section AUXILIARY AND OUTPUT DIRECTORIES for more details.
+
+
 .TP
 .B $aux_out_dir_report [0]
-For each .tex file processed, list the settings for aux and out
+For each primary .tex file processed, list the settings for aux and output
 directories, after they have been normalized from the settings specified
 during initialization.
 
-This report gives a reminder of where to look for output.
+This report gives a reminder of where to look for generated files.
 
-The report has to be done per file, because of possible directory changes
-for each file.  In the simplest cases, the result is the same as originally
-specified.  In general, e.g., with an absolute directory specified, the
-normalization helps performance and cleans up output to the screen. It also
-avoids situations where a file in the current directory is referred to by
-different names, e.g., "file.aux" and "./file.aux", which can be annoying.
+The report has to be done per primary .tex file, because of possible
+directory changes for each file (when the \fB-cd\fR option is used).  In
+the simplest cases, the directory names are the same as originally
+specified.  But in general some clean up/normalization is performed; this
+helps performance and cleans up output to the screen.
 
 
 .TP
@@ -2075,20 +2242,23 @@
         @BIBINPUTS = ( ".", "//server/bibfiles" );
         @BIBINPUTS = ( ".", "/usr/local/texmf/bibtex/bib" );
 
-Note that under MS Windows, either a forward slash "/" or a backward
-slash "\(rs" can be used to separate pathname components, so the first
-two and the second two examples are equivalent.  Each backward slash
-should be doubled to avoid running afoul of \fIPerl\fR's rules for writing
-strings. 
+Note that under MS Windows, either a forward slash "/" or a backward slash
+"\(rs" can be used to separate pathname components, so the first two and
+the second two examples are equivalent.  Each backward slash should be
+doubled to avoid running afoul of \fIPerl\fR's rules for writing
+strings. Generally, it is simplest always to use forward slashes instead of
+backward slashes.
 
-\fIImportant note:\fR This variable is now mostly obsolete in the
-current version of \fIlatexmk\fR, 
-since it has a better method of searching for files using the
-kpsewhich command.  However, if your system is an unusual one without
-the kpsewhich command, you may need to set the variable \fI at BIBINPUTS\fR.
+\fIImportant note:\fR This variable is now mostly obsolete in the current
+version of \fIlatexmk\fR, since it now uses a better method of searching
+for files using the kpsewhich command.  However, if your system is an
+unusual one without the kpsewhich command, you may need to set the variable
+\fI at BIBINPUTS\fR.
+
 .TP
 .B $biber ["biber %O %S"]
 The biber processing program.
+
 .TP
 .B $biber_silent_switch ["--onlylog"]
 Switch(es) for the biber processing program when silent mode is on.
@@ -2117,6 +2287,7 @@
 .TP
 .B $bibtex_silent_switch ["-terse"]
 Switch(es) for the BibTeX processing program when silent mode is on.
+
 .TP
 .B $bibtex_use [1]
 Under what conditions to run \fIbibtex\fR or \fIbiber\fR.  When
@@ -2144,15 +2315,6 @@
 update the bbl file(s), without testing for the existence of the bib 
 files; always delete .bbl files in a cleanup.
 
-\fBImportant note:\fR Currently, the values 1 and 1.5 do \fInot\fR work
-properly if the document uses \fIbiber\fR instead of \fIbibtex\fR. When
-\fIbiber\fR is used, the values 1 and 1.5 for \fI$bibtex_use\fR are
-equivalent to 2 as regards the running of \fIbiber\fR.  (There's a long
-story why not.  Basically, the problem is that when \fIbiber\fR is used,
-\fIlatexmk\fR only knows the names and status of the bibfiles after running
-\fIbiber\fR.  In contrast, when \fIbibtex\fR is used, the information is
-available after a run of *latex. It is a problem for the future to correct this.)
-
 .TP
 .B $cleanup_includes_cusdep_generated [0]
 If nonzero, specifies that cleanup also deletes files that are
@@ -2160,6 +2322,7 @@
 (When doing a clean up, e.g., by use of the \fB-C\fR option, custom
 dependencies are those listed in the \fI.fdb_latexmk\fR file from a
 previous run.)
+
 .TP
 .B $cleanup_includes_generated [0]
 If nonzero, specifies that cleanup also deletes files that are
@@ -2518,83 +2681,52 @@
 for \fIxdvi\fR on a UNIX system.
 .TP
 .B $emulate_aux [0]
-Whether to emulate the use of aux_dir when $aux_dir and $out_dir are
-different, rather than using the -aux-directory option for the *latex
-programs.  (MiKTeX supports -aux-directory, but TeXLive doesn't.)
+Whether to emulate the use of aux directory when $aux_dir and $out_dir are
+different, rather than using the \fB-aux-directory\fR option for the *latex
+programs.  (MiKTeX supports \fB-aux-directory\fR, but TeXLive doesn't.)
 
-If you use a version of *latex that doesn't support -aux-directory, e.g.,
-TeXLive, latexmk will automatically switch aux_dir emulation on after the
-first run of *latex, because it will find the .log file in the wrong
+If you use a version of *latex that doesn't support \fB-aux-directory\fR,
+e.g., TeXLive, latexmk will automatically switch aux_dir emulation on after
+the first run of *latex, because it will find the .log file in the wrong 
 place.  But it is better to set \fI$emulate_aux\fR to 1 in an rc file, or
 equivalently to use the \fB-emulate-aux-dir\fR option. This emulation mode
 works equally well with MiKTeX.
 
-Aux_directory emulation means that when *latex is invoked, the \fIoutput\fR
-directory provided to *latex is set to be the aux_dir. After that, any
-files that need to be in the output directory will be moved there. (These
-are the files with extensions .dvi, .ps, .pdf, .fls, .synctex, .synctex.gz.) 
+Aux directory emulation means that when *latex is invoked, the \fIoutput\fR
+directory provided to *latex is set to be the desired aux directory. After
+that, any files that need to be in the output directory will be moved
+there by latexmk. (These are the files with
+extensions .dvi, .ps, .pdf, .synctex, .synctex.gz, and, depending on the
+setting of the \fI$fls_uses_out_dir\fR variable, also the .fls file.)
 
 .TP
 .B $failure_cmd [undefined]
 See the documentation for \fI$compiling_cmd\fR.
+
 .TP
 .B $fdb_ext ["fdb_latexmk"]
 The extension of the file which \fIlatexmk\fR generates to contain a
 database of information on source files.  You will not normally need
 to change this.
+
 .TP
-.B $filetime_causality_threshold [5]; $filetime_offset_report_threshold [30]. \fR(Units of seconds.)
+.B $fls_uses_out_dir [0]
+This variable determines whether or not the .fls file should be in the
+output directory instead of the natural directory, which is the aux
+directory.  If the variable is nonzero, the .fls file is to be in the output
+directory.  See the section AUXILIARY AND OUTPUT DIRECTORIES for more
+details about these directories.  The rationale for the existence of the
+variable \fI$fls_uses_aux_dir\fR is explained there.
 
-These variables control how \fIlatexmk\fR deals with the following
-issue, which can affect the use of files that are on a remote
-filesystem (network share) instead of being on a file system local to
-the computer running \fIlatexmk\fR.  Almost users will not have to
-worry about these settings, and can ignore the following explanation.
+In all cases, if \fIlatexmk\fR finds that an .fls file has been generated in
+the opposite directory to the one specified by \fI$fls_uses_out_dir\fR, it
+copies the file to the other directory (aux or output directory as
+appropriate).  The file is copied rather than simply moved, to avoid
+potential clashes with other software that assumes the .fls file is
+generated in the directory it was written to by *latex. Thus the effect an
+incorrect setting of \fI$fls_uses_out_dir\fR is only to cause a superfluous
+copy of the .fls file to be generated.
 
-In almost all situations, \fIlatexmk\fR does not need to use the time
-stamps of the files it works with.  However, there are a couple of
-situations when it needs to know whether a certain file was created in
-the current run of a program (e.g., \fI*latex\fR) or is a leftover
-file from a previous run. It does this by comparing the modification
-time of the file with the system time just before the program was
-started. If the modification time is earlier than when the program was
-started, the file is a leftover file, which \fIlatexmk\fR treats as if
-it were not created.  If the filetime is at least the program start
-time, then it can be assumed that the file was created in the current
-run.
-
-Unfortunately, this test can fail if the file is on a remote system,
-since its system time is not necessarily synchronized with that of the
-local system; the timestamps on the remote files are set by the remote
-system, not the local system.  Generally, modern operating systems
-regularly synchronize their time with a server, so the
-non-synchronization is mostly small (a second or so, or a few
-seconds).  But even a small difference can mess up \fIlatexmk\fR's
-test.
-
-\fILatexmk\fR measures the time difference between the time on the two
-systems and compensates for this.  But the measurement (in a
-system-independent way) is only accurate to a second or two.  So
-\fIlatexmk\fR allows for a threshold on the difference between file
-and system time before it concludes that a file is a leftover file
-from a previous run. The configuration variable
-\fI$filetime_causality_theshhold\fR, which in units of seconds,
-specifies this threshold.  Luckily high precision is not needed.  The
-previous run is normally the previous run in a human run-edit-run
-cycle, and is at least many seconds back.  A few seconds is therefore
-appropriate for the threshold, \fI$filetime_causality_theshhold\fR; it
-should be non-negative always, and should be bigger than 2 if a remote
-filesystem or network share is used.
-
-If the difference in system times on the two systems is large, it
-normally indicates that at least one of the systems is misconfigured.
-The variable \fI$filetime_offset_report_threshold\fR specifies the
-smallest size of the difference (or offset) in seconds between the
-times of the local and remote system beyond which the offset is
-reported.  This is reported at the point in the \fIlatexmk\fR's
-progress that it measures the offset. The report is made if silent
-mode is used and diagnostic mode is not on.
-
 .TP
 .B $force_mode [0]
 If nonzero, continue processing past minor \fIlatex\fR errors 
@@ -2939,36 +3071,20 @@
 \fIlatexmk\fR will behave as if no viewer is running.
 .TP
 .B $out_dir [""]
-If non-blank, this variable specifies the directory in which output
-files are to be written by a run of 
-*latex.  See also the variable \fI$aux_dir\fR.  
+If non-blank, this variable specifies the output directory.
 
-The effect of this variable (when non-blank) is achieved by using the
-\fB-output-directory\fR option of *latex.  This exists in the
-usual current (Dec. 2011 and later) implementations of TeX, i.e., MiKTeX and
-TeXLive. But it may not be present in other versions.
+This is the directory in which final output files are written (dvi, ps,
+pdf, synctex, synctex.gz).  In addition, if the aux directory equals the
+output directory, as is the case by default, then other generated files are
+in effect written to the output directory.
 
-If you also use the \fB-cd\fR option, and \fI$out_dir\fR (or \fI$aux_dir\fR) contains a
-relative path, then the path is interpreted relative to the document
-directory.
+If \fI$out_dir\fR is blank, the output directory is the current directory
+at the invocation of *latex; this is equivalent to setting \fI$out_dir\fR
+to '.'.
 
-Commonly, the directory specified for output files is a subdirectory
-of the current working directory.  However, if you specify some other
-directory, e.g., "/tmp/foo" or "../output", be aware that this could
-cause problems, e.g., with \fImakeindex\fR or \fIbibtex\fR.  This is
-because modern versions of these programs, by default, will refuse to
-work when they find that they are asked to write to a file in a
-directory that appears not to be the current working directory or one
-of its subdirectories.  This is part of security measures by the whole
-TeX system that try to prevent malicious or errant TeX documents from
-incorrectly messing with a user's files.  If for \fI$out_dir\fR or
-\fI$aux_dir\fR you really do need to specify an absolute pathname
-(e.g., "/tmp/foo") or a path (e.g., "../output") that includes a
-higher-level directory, and you need to use \fImakeindex\fR or
-\fIbibtex\fR, then you need to disable the security measures
-(and assume any risks).  One way of doing this is to temporarily set an
-operating system environment variable openout_any to "a" (as in
-"all"), to override the default "paranoid" setting.
+See the section AUXILIARY AND OUTPUT DIRECTORIES for more details.
+
+
 .TP
 .B $pdf_mode [0]
 If zero, do NOT generate a pdf version of the document.
@@ -3308,7 +3424,16 @@
 Unix collection.)
 .TP
 .B $show_time [0]
-Whether to show CPU time used.
+Whether to show time used, both the total and for individual steps.
+
+\fINote\fR: On MS Windows, this is clock time.  On other OSs it is the CPU
+time used (by latexmk and the child processes it invokes).  The
+OS-dependence is because of a limitation of Windows.  If you wish to force
+the use of clock instead of CPU time, you can set
+
+    $times_are_clock = 1;
+
+
 .TP
 .B $silence_logfile_warnings [0]
 Whether after a run of *latex to summarize warnings in the log
@@ -4104,7 +4229,7 @@
 harvested too easily.)
 .SH AUTHOR
 Current version, by John Collins 
-(Version 4.78).
+(Version 4.79).
 Report bugs etc to his e-mail (jcc8 at psu.edu).
 
 Released version can be obtained from CTAN:

Modified: trunk/Master/texmf-dist/doc/man/man1/latexmk.man1.pdf
===================================================================
(Binary files differ)

Modified: trunk/Master/texmf-dist/doc/support/latexmk/CHANGES
===================================================================
--- trunk/Master/texmf-dist/doc/support/latexmk/CHANGES	2023-01-07 21:22:46 UTC (rev 65482)
+++ trunk/Master/texmf-dist/doc/support/latexmk/CHANGES	2023-01-07 21:23:15 UTC (rev 65483)
@@ -818,3 +818,16 @@
     variables set in rc files.
   Other improvements in treatment of non-ASCII characters in filenames.
 
+From v. 4.78 to 4.79
+  Check rc files for valid UTF-8; remove initial BOM.
+  Improve some warnings and messages.
+  Correctly implement conditional use of biber, to be able to preserve bbl
+    file when bib file doesn't exist.  This behavior now matches the
+    conditional use of bibtex.
+  Solve problem that processing times under Windows were reported as zero.
+  Solve occasional problems caused by granularity of file times when detecting
+    files generated during a run of *latex
+  Configurably change default location of fls file to aux directory, to match
+    behavior of recent versions of MiKTeX.
+  Update documentation especially about aux and output directories.
+

Modified: trunk/Master/texmf-dist/doc/support/latexmk/INSTALL
===================================================================
--- trunk/Master/texmf-dist/doc/support/latexmk/INSTALL	2023-01-07 21:22:46 UTC (rev 65482)
+++ trunk/Master/texmf-dist/doc/support/latexmk/INSTALL	2023-01-07 21:23:15 UTC (rev 65483)
@@ -1,6 +1,6 @@
             INSTALLING latexmk
             ==================
-      (Version 4.78, 18 Nov. 2022)
+      (Version 4.79, 7 Jan. 2023)
 
             John Collins
             Physics Department

Modified: trunk/Master/texmf-dist/doc/support/latexmk/README
===================================================================
--- trunk/Master/texmf-dist/doc/support/latexmk/README	2023-01-07 21:22:46 UTC (rev 65482)
+++ trunk/Master/texmf-dist/doc/support/latexmk/README	2023-01-07 21:23:15 UTC (rev 65483)
@@ -1,5 +1,5 @@
-Latexmk, version 4.78, 18 Nov 2022
-----------------------------------
+Latexmk, version 4.79, 7 Jan 2023
+---------------------------------
 
 Latexmk completely automates the process of generating a LaTeX
 document.  Essentially, it is a highly specialized cousin of the

Modified: trunk/Master/texmf-dist/doc/support/latexmk/latexmk.pdf
===================================================================
(Binary files differ)

Modified: trunk/Master/texmf-dist/doc/support/latexmk/latexmk.txt
===================================================================
--- trunk/Master/texmf-dist/doc/support/latexmk/latexmk.txt	2023-01-07 21:22:46 UTC (rev 65482)
+++ trunk/Master/texmf-dist/doc/support/latexmk/latexmk.txt	2023-01-07 21:23:15 UTC (rev 65483)
@@ -61,7 +61,7 @@
 
 
 
-                               18 November 2022                              1
+                                7 January 2023                               1
 
 
 
@@ -127,7 +127,7 @@
 
 
 
-                               18 November 2022                              2
+                                7 January 2023                               2
 
 
 
@@ -193,7 +193,7 @@
 
 
 
-                               18 November 2022                              3
+                                7 January 2023                               3
 
 
 
@@ -204,21 +204,23 @@
 
        -auxdir=FOO or -aux-directory=FOO
               Sets  the  directory for auxiliary output files of *latex (.aux,
-              .log etc).  See the description of the  $aux_dir  variable,  the
-              -emulate-aux-dir,  and  the $emulate_aux variables for some com-
-              plications in using this option with the TeX Live distribution.
+              .log etc).  These are all the generated files, with  the  excep-
+              tion of final output files (.dvi, .ps, .pdf, .synctex.gz, .sync-
+              tex).  See the -outdir/-output-directory option for  directories
+              for the final output files.
 
-              See  also  the  -outdir/-output-directory   options,   and   the
-              $aux_dir,  $out_dir,  and  $search_path_separator  configuration
-              variables of latexmk.  In particular, see the  documentation  of
-              $out_dir  for  some  complications  on  what directory names are
-              suitable.
+              If the directory specified for the -aux/-aux-directory option is
+              blank, then the default is used, which is to be the same as  the
+              output directory.
 
               If you also use the -cd option, and the specified auxiliary out-
-              put  directory  is a relative path, then the path is interpreted
+              put directory is a relative path, then the path  is  interpreted
               relative to the document directory.
 
+              See  the  section  AUXILIARY AND OUTPUT DIRECTORIES for more de-
+              tails.
 
+
        -bibtex
               When the source file uses bbl files for bibliography, run bibtex
               or biber as needed to regenerate the bbl files.
@@ -254,12 +256,10 @@
               This  is the default setting.  It can also be configured by set-
               ting the $bibtex_use variable to 1 in a configuration file.
 
-              The reason for using this setting is first  to  allow  automatic
-              switching between the use and non-use of bibtex depending on the
 
 
 
-                               18 November 2022                              4
+                                7 January 2023                               4
 
 
 
@@ -268,6 +268,8 @@
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+              The reason for using this setting is first  to  allow  automatic
+              switching between the use and non-use of bibtex depending on the
               existence or not of a bib file.  In  addition,  when  submitting
               articles  to  a  scientific journal, it is common to submit only
               .tex and .bbl files (plus graphics files), but not a .bib  file.
@@ -319,21 +321,22 @@
               sumed.
 
 
-       -bi <intensity>
-              How dark to print the banner message.  A decimal number  between
-              0 and 1.  0 is black and 1 is white.  The default is 0.95, which
 
 
 
-                               18 November 2022                              5
 
+                                7 January 2023                               5
 
 
 
 
+
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+       -bi <intensity>
+              How dark to print the banner message.  A decimal number  between
+              0 and 1.  0 is black and 1 is white.  The default is 0.95, which
               is OK unless your toner cartridge is getting low.
 
 
@@ -385,21 +388,21 @@
               dition of dvi, postscript and pdf files, and those specified  in
               the $clean_full_ext configuration variable.
 
-              This  cleanup  is instead of a regular make.  See the -gg option
-              if you want to do a cleanup followed by a make.
 
 
 
+                                7 January 2023                               6
 
-                               18 November 2022                              6
 
 
 
 
-
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+              This  cleanup  is instead of a regular make.  See the -gg option
+              if you want to do a cleanup followed by a make.
+
               See the -c option for the specification of whether or  not  .bbl
               files are treated as non-regeneratable or regeneratable.
 
@@ -452,20 +455,19 @@
               option will override this option as this is really just a  short
               way of specifying:
 
-                   latexmk -bm DRAFT
 
 
+                                7 January 2023                               7
 
 
-                               18 November 2022                              7
 
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+                   latexmk -bm DRAFT
 
-
               Note  that  if the -d option is specified, the -ps option is as-
               sumed.
 
@@ -518,20 +520,20 @@
               file.
 
               Example usage: To use dviselect to select only the even pages of
-              the dvi file:
 
 
 
+                                7 January 2023                               8
 
-                               18 November 2022                              8
 
 
 
 
-
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+              the dvi file:
+
                    latexmk -dF "dviselect even" foo.tex
 
 
@@ -583,21 +585,21 @@
               The code is Perl code of the same form as is used  in  latexmk's
               initialization  files.  For more details, see the information on
               the -r option, and the section about  "Configuration/initializa-
-              tion  (RC)  files".  The code is typically a sequence of assign-
-              ment statements separated by semicolons.
+              tion   (RC)  files".   The  code  is  typically  a  sequence  of
 
 
 
+                                7 January 2023                               9
 
-                               18 November 2022                              9
 
 
 
 
-
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+              assignment statements separated by semicolons.
+
               The code is executed when the -e option  is  encountered  during
               latexmk's  parsing of its command line.  See the -r option for a
               way of executing initialization code from a file.  An error  re-
@@ -640,22 +642,20 @@
 
 
        -emulate-aux-dir
-              Emulate -aux-directory instead of leaving it to the *latex  pro-
-              grams  to  do  it.  (MiKTeX supports -aux-directory, but TeXLive
-              doesn't.)
+              Emulate the use of an aux directory instead of leaving it to the
+              *latex  programs to do it.  (MiKTeX supports -aux-directory, but
+              TeXLive doesn't.)
 
-              For more details see the explanation for the configuration vari-
-              able $emulate_aux.
+              See the section AUXILIARY AND OUTPUT DIRECTORIES  for  more  de-
+              tails.
 
 
        -emulate-aux-dir-
-              Turn  off  emulatation -aux-directory and leave it to the *latex
-              program to handle the case that aux_dir is not equal to out_dir.
-              Note  that  if  you  use  TeXLive,  which  doesn't support -aux-
+              Turn off emulation to implement an aux directory and leave it to
 
 
 
-                               18 November 2022                             10
+                                7 January 2023                              10
 
 
 
@@ -664,9 +664,11 @@
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-              directory, latexmk will automatically switch  aux_dir  emulation
-              on  after the first run of *latex, because it will find the .log
-              file in the wrong place.
+              the *latex program to handle the case that the aux directory  is
+              different  from  the  output  directory.   Note  that if you use
+              TeXLive, which doesn't support -aux-directory, latexmk will  au-
+              tomatically  switch  aux_dir emulation on after the first run of
+              *latex, because it will find the .log file in the wrong place.
 
 
        -f     Force latexmk to continue document  processing  despite  errors.
@@ -715,13 +717,11 @@
               *latex, and the passing of this option to these programs is part
               of latexmk's implementation of -jobname.
 
-              There is one enhancement, that the STRING may contain the place-
-              holder '%A'. This will be substituted by the basename of the TeX
-              file.  The primary purpose is when multiple files are  specified
+              There is one  enhancement,  that  the  STRING  may  contain  the
 
 
 
-                               18 November 2022                             11
+                                7 January 2023                              11
 
 
 
@@ -730,12 +730,14 @@
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-              on  the  command  line to latexmk, and you wish to use a jobname
-              with a different file-dependent value for each file.  For  exam-
-              ple, suppose you had .tex files test1.tex and test2.tex, and you
-              wished to compare the results of compilation by *latex and those
-              with xelatex.  Then under a unix-type operating system you could
-              use the command line
+              placeholder  '%A'.  This  will be substituted by the basename of
+              the TeX file.  The primary purpose is when  multiple  files  are
+              specified  on the command line to latexmk, and you wish to use a
+              jobname with a different file-dependent  value  for  each  file.
+              For example, suppose you had .tex files test1.tex and test2.tex,
+              and you wished to compare the results of compilation  by  *latex
+              and those with xelatex.  Then under a unix-type operating system
+              you could use the command line
 
                   latexmk -pdf -jobname=%A-pdflatex *.tex
                   latexmk -pdfxe -jobname=%A-xelatex *.tex
@@ -782,12 +784,10 @@
               need  to change the single quotes to double quotes (or something
               else).
 
-              Note: This option when provided with the COMMAND  argument  only
-              sets the command for invoking latex; it does not turn on the use
 
 
 
-                               18 November 2022                             12
+                                7 January 2023                              12
 
 
 
@@ -796,6 +796,8 @@
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+              Note: This option when provided with the COMMAND  argument  only
+              sets the command for invoking latex; it does not turn on the use
               of latex. That is done by other options or in an  initialization
               file.
 
@@ -847,21 +849,24 @@
               lent to the -deps option.
 
 
-       -MF file
-              If  a  list of dependents is made, the -MF specifies the file to
-              write it to.
 
 
 
-                               18 November 2022                             13
 
+                                7 January 2023                              13
 
 
 
 
+
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+       -MF file
+              If  a  list of dependents is made, the -MF specifies the file to
+              write it to.
+
+
        -MP    If a list of dependents is made, include a phony target for each
               source  file.  If you use the dependents list in a Makefile, the
               dummy rules work around errors the program make gives if you re-
@@ -911,23 +916,22 @@
               the same file and not start a new one if a previous previewer is
               running.  However, its test sometimes fails (notably if there is
               an already-running previewer that is viewing a file of the  same
-              name  as  the current file, but in a different directory).  This
-              option turns off the default behavior.
 
 
 
+                                7 January 2023                              14
 
 
 
-                               18 November 2022                             14
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+              name  as  the current file, but in a different directory).  This
+              option turns off the default behavior.
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
-
        -new-viewer-
               The inverse of the -new-viewer option.  It puts latexmk  in  its
               normal behavior that in preview-continuous mode it checks for an
@@ -962,64 +966,64 @@
 
        -outdir=FOO or -output-directory=FOO
 
-              Sets  the  directory  for  the  output  files  of  *latex.  This
-              achieves its effect by the -output-directory option  of  *latex,
-              which currently (Dec. 2011 and later) is implemented on the com-
-              mon versions of *latex, i.e., MiKTeX and TeXLive.  It may not be
-              present in other versions.
+              Sets the directory for the output files of *latex.
 
-              See  also  the -auxdir/-aux-directory options, and the $aux_dir,
-              $out_dir, and $search_path_separator configuration variables  of
-              latexmk.   In  particular, see the documentation of $out_dir for
-              some complications on what directory names are suitable.
+              If the aux directory is not set or is the same as the output di-
+              rectory, then all output files of *latex are sent to the  output
+              directory.
 
-              If you also use the -cd option, and the specified output  direc-
-              tory  is  a relative path, then the path is interpreted relative
-              to the document directory.
+              If the aux directory is set, e.g., by the option -auxdir, and is
+              not equal to the output directory, then only final output  files
+              (.dvi,  .ps, .pdf, .synctex, .synctex.gz) are sent to the output
+              directory. Other generated files are sent to the aux directory.
 
+              See the section AUXILIARY AND OUTPUT DIRECTORIES  for  more  de-
+              tails.
 
-       -output-format=FORMAT
-              This option is one that is  allowed  for  latex,  lualatex,  and
-              pdflatex.  But  it is not passed to these programs.  Instead la-
-              texmk emulates it in a way suitable for the context  of  latexmk
 
 
 
-                               18 November 2022                             15
 
 
+                                7 January 2023                              15
 
 
 
+
+
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+       -output-format=FORMAT
+              This  option  is  one  that  is allowed for latex, lualatex, and
+              pdflatex. But it is not passed to these programs.   Instead  la-
+              texmk  emulates  it in a way suitable for the context of latexmk
               and its workflows.
 
-              If  FORMAT  is dvi, then dvi output is turned on, and postscript
-              and pdf output are turned off. This is equivalent to  using  the
+              If FORMAT is dvi, then dvi output is turned on,  and  postscript
+              and  pdf  output are turned off. This is equivalent to using the
               options -dvi -ps- -pdf-.
 
-              If  FORMAT  is  pdf,  then  pdf output is turned on, and dvi and
-              postscript output are turned off. This is  equivalent  to  using
+              If FORMAT is pdf, then pdf output is  turned  on,  and  dvi  and
+              postscript  output  are  turned off. This is equivalent to using
               the options -pdf -ps- -dvi-.
 
               If FORMAT is anything else, latexmk gives an error.
 
 
-       -p     Print  out  the  document.  By default the file to be printed is
-              the first in the list postscript, pdf, dvi that is  being  made.
+       -p     Print out the document.  By default the file to  be  printed  is
+              the  first  in the list postscript, pdf, dvi that is being made.
               But you can use the -print=... option to change the type of file
               to be printed, and you can configure this in a start up file (by
               setting the $print_type variable).
 
-              However,  printing  is  enabled by default only under UNIX/Linux
+              However, printing is enabled by default  only  under  UNIX/Linux
               systems, where the default is to use the lpr command and only on
               postscript files.  In general, the correct behavior for printing
               very much depends on your system's software.  In particular, un-
-              der  MS-Windows you must have suitable program(s) available, and
-              you must have configured the print  commands  used  by  latexmk.
-              This  can  be  non-trivial.   See the documentation on the $lpr,
+              der MS-Windows you must have suitable program(s) available,  and
+              you  must  have  configured  the print commands used by latexmk.
+              This can be non-trivial.  See the  documentation  on  the  $lpr,
               $lpr_dvi, and $lpr_pdf configuration variables to see how to set
               the commands for printing.
 
@@ -1027,72 +1031,72 @@
               turns them off.
 
 
-       -pdf   Generate pdf version of document using pdflatex.  (If  you  wish
+       -pdf   Generate  pdf  version of document using pdflatex.  (If you wish
               to use lualatex or xelatex, you can use whichever of the options
-              -pdflua, -pdfxe, -lualatex or -xelatex applies.)   To  configure
-              latexmk  to  have  such  behavior by default, see the section on
+              -pdflua,  -pdfxe,  -lualatex or -xelatex applies.)  To configure
+              latexmk to have such behavior by default,  see  the  section  on
               "Configuration/initialization (rc) files".
 
 
        -pdfdvi
-              Generate dvi file and then pdf version of document from the  dvi
+              Generate  dvi file and then pdf version of document from the dvi
               file, by default using dvipdf.
 
-              The  program used to compile the document to dvi is latex by de-
-              fault, but this can be changed to dvilulatex by the use  of  the
+              The program used to compile the document to dvi is latex by  de-
+              fault,  but  this can be changed to dvilulatex by the use of the
               -dvilua option or by setting $dvi_mode to 2.
 
 
-       -pdflua
-              Generate pdf version of document using lualatex.
 
 
-       -pdfps
 
 
+                                7 January 2023                              16
 
-                               18 November 2022                             16
 
 
 
 
-
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-              Generate dvi file, ps file from the dvi file,  and then pdf file
+       -pdflua
+              Generate pdf version of document using lualatex.
+
+
+       -pdfps Generate dvi file, ps file from the dvi file,  and then pdf file
               from the ps file.
 
-              The program used to compile the document to dvi is latex by  de-
-              fault,  but  this can be changed to dvilulatex by the use of the
+              The  program used to compile the document to dvi is latex by de-
+              fault, but this can be changed to dvilulatex by the use  of  the
               -dvilua option or by setting $dvi_mode to 2.
 
 
-       -pdfxe Generate pdf version of document using xelatex.   Note  that  to
-              optimize  processing  time,  latexmk uses xelatex to generate an
-              .xdv file rather than a pdf file directly.  Only after  possibly
-              multiple  runs to generate a fully up-to-date .xdv file does la-
+       -pdfxe Generate  pdf  version  of document using xelatex.  Note that to
+              optimize processing time, latexmk uses xelatex  to  generate  an
+              .xdv  file rather than a pdf file directly.  Only after possibly
+              multiple runs to generate a fully up-to-date .xdv file does  la-
               texmk then call xdvipdfmx to generate the final .pdf file.
 
-              (Note: The reason why latexmk arranges for xelatex  to  make  an
-              .xdv  file instead of the xelatex's default of a .pdf file is as
-              follows: When the document includes large graphics files,  espe-
-              cially  .png  files,  the production of a .pdf file can be quite
+              (Note:  The  reason  why latexmk arranges for xelatex to make an
+              .xdv file instead of the xelatex's default of a .pdf file is  as
+              follows:  When the document includes large graphics files, espe-
+              cially .png files, the production of a .pdf file  can  be  quite
               time consuming, even when the creation of the .xdv file by xela-
-              tex  is  fast.  So the use of the intermediate .xdv file can re-
+              tex is fast.  So the use of the intermediate .xdv file  can  re-
               sult in substantial gains in procesing time, since the .pdf file
               is produced once rather than on every run of xelatex.)
 
 
-       -pdf-  Turn  off  generation  of pdf version of document.  (This can be
-              used to override a setting in a configuration file.  It may  get
+       -pdf-  Turn off generation of pdf version of document.   (This  can  be
+              used  to override a setting in a configuration file.  It may get
               overridden if some other option requires the generation of a pdf
               file.)
 
-              If after all options have  been  processed,  pdf  generation  is
-              still  turned  off, then generation of a dvi file will be turned
+              If  after  all  options  have  been processed, pdf generation is
+              still turned off, then generation of a dvi file will  be  turned
               on, and then the program used to compiled a document will be la-
-              tex  (or,  more  precisely, whatever program is configured to be
+              tex (or, more precisely, whatever program is  configured  to  be
               used in the $latex configuration variable).
 
 
@@ -1100,7 +1104,7 @@
               This sets the generation of pdf files by pdflatex, and turns off
               the generation of dvi and ps files.
 
-              Note:  to  set  the command used when pdflatex is specified, see
+              Note: to set the command used when pdflatex  is  specified,  see
               the -pdflatex="COMMAND" option.
 
 
@@ -1110,33 +1114,33 @@
               mally contains spaces, it should be quoted, e.g.,
 
                    latexmk  -pdf  -pdflatex="pdflatex  --shell-escape  %O  %S"
-              foo.tex
 
-              The  specification of the contents of the string are the same as
-              for the $pdflatex configuration variable.  (The option -pdflatex
 
 
+                                7 January 2023                              17
 
-                               18 November 2022                             17
 
 
 
 
-
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+              foo.tex
+
+              The specification of the contents of the string are the same  as
+              for the $pdflatex configuration variable.  (The option -pdflatex
               in fact sets the variable $pdflatex.)  Depending on your operat-
-              ing system and the command-line shell you  are  using,  you  may
-              need  to change the single quotes to double quotes (or something
+              ing  system  and  the  command-line shell you are using, you may
+              need to change the single quotes to double quotes (or  something
               else).
 
-              Note: This option when provided with the COMMAND  argument  only
-              sets  the command for invoking pdflatex; it does not turn on the
+              Note:  This  option when provided with the COMMAND argument only
+              sets the command for invoking pdflatex; it does not turn on  the
               use of pdflatex. That is done by other options or in an initial-
               ization file.
 
-              To  set  the  command for running latex (rather than the command
+              To set the command for running latex (rather  than  the  command
               for pdflatex) see the -latex option.
 
 
@@ -1151,10 +1155,10 @@
        -pretex=CODE
 
               Given that CODE is some TeX code, this options sets that code to
-              be  executed  before  inputting source file.  This only works if
+              be executed before inputting source file.  This  only  works  if
               the command for invoking the relevant *latex is suitably config-
-              ured.   See the documentation of the variable $pre_tex_code, and
-              the substitution strings %P and %U for more details.   This  op-
+              ured.  See the documentation of the variable $pre_tex_code,  and
+              the  substitution  strings %P and %U for more details.  This op-
               tion works by setting the variable $pre_tex_code.
 
               See also the -usepretex option.
@@ -1174,24 +1178,23 @@
 
 
        -print=dvi, -print=ps, -print=pdf, -print=auto,
-              Define which kind of file is printed.  This option also  ensures
+              Define  which kind of file is printed.  This option also ensures
               that the requisite file is made, and turns on printing.
 
-              The (default) case -print=auto determines the kind of print file
-              automatically from the set of files that  is  being  made.   The
-              first  in  the list postscript, pdf, dvi that is among the files
 
 
+                                7 January 2023                              18
 
-                               18 November 2022                             18
 
 
 
 
-
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+              The (default) case -print=auto determines the kind of print file
+              automatically  from  the  set  of files that is being made.  The
+              first in the list postscript, pdf, dvi that is among  the  files
               to be made is the one used for print out.
 
 
@@ -1199,13 +1202,13 @@
 
 
        -ps-   Turn off generation of postscript version of document.  This can
-              be  used to override a setting in a configuration file.  (It may
-              get overridden by some other option that requires  a  postscript
+              be used to override a setting in a configuration file.  (It  may
+              get  overridden  by some other option that requires a postscript
               file, for example a request for printing.)
 
 
-       -pF    Postscript  file  filtering.   The  argument to this option is a
-              filter which will generate a filtered postscript file  with  the
+       -pF    Postscript file filtering.  The argument to  this  option  is  a
+              filter  which  will generate a filtered postscript file with the
               extension ".psF".  All extra processing (e.g. preview, printing)
               will then be performed on this filtered postscript file.
 
@@ -1218,17 +1221,16 @@
                    latexmk -ps -pF "psnup -2" foo.tex
 
               Whether to use single or double quotes round the "psnup -2" will
-              depend  on  your  command interpreter, as used by the particular
+              depend on your command interpreter, as used  by  the  particular
               version of perl and the operating system on your computer.
 
 
-       -pv    Run file previewer.  If the -view option is used, this will  se-
-              lect the kind of file to be previewed (.dvi, .ps or .pdf).  Oth-
-              erwise the viewer views the "highest" kind of file selected,  by
-              the  -dvi,  -ps,  -pdf,  -pdfps options, in the order .dvi, .ps,
-              .pdf (low to high).  If no file type has been selected, the  dvi
-              previewer will be used.  This option is incompatible with the -p
-              and -pvc options, so it turns them off.
+       -pv    Run  file previewer.  If the -view option is used, that will se-
+              lect the kind of file to be previewed (.pdf, .ps or .dvi).  Oth-
+              erwise  the  viewer views the "highest" kind of output file that
+              is made, with the ordering being .pdf, .ps, .dvi (high to  low).
+              This  option is incompatible with the -p and -pvc options, so it
+              turns them off.
 
 
        -pv-   Turn off -pv.
@@ -1244,12 +1246,10 @@
               compatible  with  the  -p and -pv options, so it turns these op-
               tions off.
 
-              The -pvc option also turns off force mode (-f), as  is  normally
-              best  for  continuous  preview  mode.   If you really want force
 
 
 
-                               18 November 2022                             19
+                                7 January 2023                              19
 
 
 
@@ -1258,6 +1258,8 @@
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+              The -pvc option also turns off force mode (-f), as  is  normally
+              best  for  continuous  preview  mode.   If you really want force
               mode, use the options in the order -pvc -f.
 
               With a good previewer the display will be automatically updated.
@@ -1311,19 +1313,18 @@
               Read the specified initialization file ("RC file")  before  pro-
               cessing.
 
-              Be careful about the ordering: (1) Standard initialization files
 
 
+                                7 January 2023                              20
 
-                               18 November 2022                             20
 
 
 
 
-
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+              Be careful about the ordering: (1) Standard initialization files
               -- see the section below on  "Configuration/initialization  (RC)
               files"  --  are read first.  (2) Then the options on the command
               line are acted on in the order they are given.  Therefore if  an
@@ -1380,13 +1381,12 @@
 
 
 
+                                7 January 2023                              21
 
-                               18 November 2022                             21
 
 
 
 
-
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
@@ -1447,7 +1447,7 @@
 
 
 
-                               18 November 2022                             22
+                                7 January 2023                              22
 
 
 
@@ -1462,47 +1462,48 @@
               the definition.)
 
 
-       -time  Show  CPU  time  used.   See  also  the  configuration  variable
+       -time  Show time used.  (On MS Windows, what is shown is clock time; on
+              other  systems  CPU  time.)  See also the configuration variable
               $show_time.
 
 
-       -time- Do  not show CPU time used.  See also the configuration variable
+       -time- Do not show time used.   See  also  the  configuration  variable
               $show_time.
 
 
        -use-make
-              When after a run of *latex, there  are  warnings  about  missing
-              files  (e.g.,  as  requested  by the LaTeX \input, \include, and
-              \includgraphics commands), latexmk tries to make them by a  cus-
-              tom  dependency. If no relevant custom dependency with an appro-
+              When  after  a  run  of *latex, there are warnings about missing
+              files (e.g., as requested by the  LaTeX  \input,  \include,  and
+              \includgraphics  commands), latexmk tries to make them by a cus-
+              tom dependency. If no relevant custom dependency with an  appro-
               priate source file is found, and if the -use-make option is set,
-              then  as  a last resort latexmk will try to use the make program
+              then as a last resort latexmk will try to use the  make  program
               to try to make the missing files.
 
-              Note that the filename may be specified  without  an  extension,
-              e.g.,  by  \includegraphics{drawing}  in  a LaTeX file.  In that
-              case, latexmk will try making drawing.ext with ext set  in  turn
-              to  the  possible  extensions that are relevant for latex (or as
+              Note  that  the  filename may be specified without an extension,
+              e.g., by \includegraphics{drawing} in a  LaTeX  file.   In  that
+              case,  latexmk  will try making drawing.ext with ext set in turn
+              to the possible extensions that are relevant for  latex  (or  as
               appropriate pdflatex, lualatex, xelatex).
 
-              See also the documentation for  the  $use_make_for_missing_files
+              See  also  the documentation for the $use_make_for_missing_files
               configuration variable.
 
 
        -use-make-
-              Do  not use the make program to try to make missing files.  (De-
+              Do not use the make program to try to make missing files.   (De-
               fault.)
 
 
        -usepretex
               Sets the command lines for latex, etc, so that they use the code
-              that  is defined by the variable $pre_tex_code or that is set by
+              that is defined by the variable $pre_tex_code or that is set  by
               the option -pretex=CODE to execute the specified TeX code before
-              the  source  file  is  read.  This option overrides any previous
+              the source file is read.  This  option  overrides  any  previous
               definition of the command lines.
 
-              The result is that $latex = 'latex %O  %P',  and  similarly  for
-              $pdflatex,  $lualatex, and $xelatex.  (The option -no-pdf needed
+              The  result  is  that  $latex = 'latex %O %P', and similarly for
+              $pdflatex, $lualatex, and $xelatex.  (The option -no-pdf  needed
               for $xelatex is provided automatically, given that %O appears in
               the definition.)
 
@@ -1512,13 +1513,12 @@
 
 
 
+                                7 January 2023                              23
 
-                               18 November 2022                             23
 
 
 
 
-
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
@@ -1536,25 +1536,25 @@
        -view=default, -view=dvi, -view=ps, -view=pdf, -view=none
               Set the kind of file used when previewing is requested (e.g., by
               the -pv or -pvc switches).  The default is to view the "highest"
-              kind  of  requested  file  (in  the low-to-high order .dvi, .ps,
+              kind of requested file (in  the  low-to-high  order  .dvi,  .ps,
               .pdf).
 
-              Note the possibility -view=none where no  viewer  is  opened  at
-              all.   One example of is use is in conjunction with the -pvc op-
-              tion, when you want latexmk to do  a  compilation  automatically
-              whenever  source  file(s) change, but do not want a previewer to
+              Note  the  possibility  -view=none  where no viewer is opened at
+              all.  One example of is use is in conjunction with the -pvc  op-
+              tion,  when  you  want latexmk to do a compilation automatically
+              whenever source file(s) change, but do not want a  previewer  to
               be opened.
 
 
        -Werror
-              This causes latexmk to return a non-zero status code if  any  of
-              the  files  processed  gives a warning about problems with cita-
-              tions or references (i.e., undefined citations or references  or
-              about  multiply  defined references).  This is after latexmk has
-              completed all the runs it needs to try  and  resolve  references
-              and  citations.  Thus -Werror causes latexmk to treat such warn-
+              This  causes  latexmk to return a non-zero status code if any of
+              the files processed gives a warning about  problems  with  cita-
+              tions  or references (i.e., undefined citations or references or
+              about multiply defined references).  This is after  latexmk  has
+              completed  all  the  runs it needs to try and resolve references
+              and citations.  Thus -Werror causes latexmk to treat such  warn-
               ings as errors, but only when they occur on the last run of *la-
-              tex  and  only after processing is complete.  Also can be set by
+              tex and only after processing is complete.  Also can be  set  by
               the configuration variable $warnings_as_errors.
 
 
@@ -1563,7 +1563,7 @@
 
        -xelatex
               Use xelatex.  That is, use xelatex to process the source file(s)
-              to  pdf.   The  generation of dvi and postscript files is turned
+              to pdf.  The generation of dvi and postscript  files  is  turned
               off.
 
               This option is equivalent to using the following set of options
@@ -1570,16 +1570,16 @@
 
                    -pdfxe -dvi- -ps-
 
-              [Note: Note that the method of implementation  of  this  option,
-              but  not  its  intended primary effect, differ from some earlier
-              versions of latexmk. Latexmk first uses xelatex to make an  .xdv
-              file,  and  does  all  the extra runs needed (including those of
-              bibtex, etc).  Only after that does it make the  pdf  file  from
-              the  .xdv  file, using xdvipdfmx.  See the documentation for the
+              [Note:  Note  that  the method of implementation of this option,
+              but not its intended primary effect, differ  from  some  earlier
+              versions  of latexmk. Latexmk first uses xelatex to make an .xdv
+              file, and does all the extra runs  needed  (including  those  of
+              bibtex,  etc).   Only  after that does it make the pdf file from
+              the .xdv file, using xdvipdfmx.  See the documentation  for  the
 
 
 
-                               18 November 2022                             24
+                                7 January 2023                              24
 
 
 
@@ -1592,23 +1592,23 @@
 
 
        -xelatex="COMMAND"
-              This sets the string specifying the command to run xelatex.   It
+              This  sets the string specifying the command to run xelatex.  It
               sets the variable $xelatex.
 
               Warning: It is important to ensure that the -no-pdf is used when
-              xelatex is invoked, since latexmk expects xelatex to produce  an
-              .xdv  file,  not  a  .pdf file. If you provide %O in the command
-              specification, this will be done automatically.  See  the  docu-
-              mentation  for  the  -pdfxe  option for why latexmk makes a .xdv
+              xelatex  is invoked, since latexmk expects xelatex to produce an
+              .xdv file, not a .pdf file. If you provide  %O  in  the  command
+              specification,  this  will be done automatically.  See the docu-
+              mentation for the -pdfxe option for why  latexmk  makes  a  .xdv
               file rather than a .pdf file when xelatex is used.
 
               An example of the use of the -pdfxelatex option:
 
-                   latexmk -pdfxe -pdfxelatex="xelatex --shell-escape  %O  %S"
+                   latexmk  -pdfxe  -pdfxelatex="xelatex --shell-escape %O %S"
               foo.tex
 
-              Note:  This  option when provided with the COMMAND argument only
-              sets the command for invoking lualatex; it does not turn on  the
+              Note: This option when provided with the COMMAND  argument  only
+              sets  the command for invoking lualatex; it does not turn on the
               use of lualatex. That is done by other options or in an initial-
               ization file.
 
@@ -1615,11 +1615,11 @@
 
        Compatibility between options
 
-       The preview-continuous option -pvc can only work with one file.  So  in
-       this  case  you  will normally only specify one filename on the command
+       The  preview-continuous option -pvc can only work with one file.  So in
+       this case you will normally only specify one filename  on  the  command
        line.
 
-       Options -p, -pv and -pvc are mutually exclusive.  So each of these  op-
+       Options  -p, -pv and -pvc are mutually exclusive.  So each of these op-
        tions turns the others off.
 
 
@@ -1645,7 +1645,7 @@
 
 
 
-                               18 November 2022                             25
+                                7 January 2023                              25
 
 
 
@@ -1657,53 +1657,53 @@
 DEALING WITH ERRORS, PROBLEMS, ETC
        Some possibilities:
 
-       a.  If you get a strange error, do look carefully at the output that is
-       on the screen and in log files.  While there is much  that  is  notori-
+       a. If you get a strange error, do look carefully at the output that  is
+       on  the  screen  and in log files.  While there is much that is notori-
        ously verbose in the output of latex (and that is added to by latexmk),
-       the verbosity is there for a reason: to enable  the  user  to  diagnose
-       problems.   Latexmk  does repeat some messages at the end of a run that
-       it thinks would otherwise be easy to miss in the middle of  other  out-
+       the  verbosity  is  there  for a reason: to enable the user to diagnose
+       problems.  Latexmk does repeat some messages at the end of a  run  that
+       it  thinks  would otherwise be easy to miss in the middle of other out-
        put.
 
        b. Generally, remember that latexmk does its work by running other pro-
        grams.  Your first priority in dealing with errors should be to examine
        what went wrong with the individual programs.  Then you need to correct
-       the causes of errors in the runs of these programs.  (Often these  come
-       from  errors in the source document, but they could also be about miss-
+       the  causes of errors in the runs of these programs.  (Often these come
+       from errors in the source document, but they could also be about  miss-
        ing LaTeX packages, etc.)
 
        c. If latexmk doesn't run the programs the way you would like, then you
-       need  to look in this documentation at the list of command line options
-       and then at the sections on configuration/initialization files.  A  lot
-       of  latexmk's  behavior  is configurable to deal with particular situa-
+       need to look in this documentation at the list of command line  options
+       and  then at the sections on configuration/initialization files.  A lot
+       of latexmk's behavior is configurable to deal  with  particular  situa-
        tions.  (But there is a lot of reading!)
 
-       The remainder of these notes consists of ideas for  dealing  with  more
+       The  remainder  of  these notes consists of ideas for dealing with more
        difficult situations.
 
-       d.  Further tricks can involve replacing the standard commands that la-
+       d. Further tricks can involve replacing the standard commands that  la-
        texmk runs by other commands or scripts.
 
-       e. For possible examples of code for use in an RC file, see the  direc-
-       tory   example_rcfiles   in  the  distribution  of  latexmk  (e.g.,  at
+       e.  For possible examples of code for use in an RC file, see the direc-
+       tory  example_rcfiles  in  the  distribution  of  latexmk   (e.g.,   at
        http://mirror.ctan.org/support/latexmk/example_rcfiles).  Even if these
        examples don't do what you want, they may provide suitable inspiration.
 
-       f.  There's  a  useful trick that can be used when you use lualatex in-
-       stead of pdflatex (and in some related  situations).   The  problem  is
-       that  latexmk won't notice a dependency on a file, bar.baz say, that is
-       input by the lua code in your document instead of by  the  LaTeX  part.
-       (Thus  if you change bar.baz and rerun latexmk, then latexmk will think
-       no files have changed and not rerun lualatex, whereas if you had  '\in-
-       put{bar.baz}'  in  the LaTeX part of the document, latexmk would notice
-       the change.)  One solution is just to put the  following  somewhere  in
+       f. There's a useful trick that can be used when you  use  lualatex  in-
+       stead  of  pdflatex  (and  in some related situations).  The problem is
+       that latexmk won't notice a dependency on a file, bar.baz say, that  is
+       input  by  the  lua code in your document instead of by the LaTeX part.
+       (Thus if you change bar.baz and rerun latexmk, then latexmk will  think
+       no  files have changed and not rerun lualatex, whereas if you had '\in-
+       put{bar.baz}' in the LaTeX part of the document, latexmk  would  notice
+       the  change.)   One  solution is just to put the following somewhere in
        the LaTeX part of the document:
 
                      \typeout{(bar.baz)}
 
-       This  puts  a  line in the log file that latexmk will treat as implying
-       that the file bar.baz was read.  (At present I don't know a way of  do-
-       ing  this automatically.)  Of course, if the file has a different name,
+       This puts a line in the log file that latexmk will  treat  as  implying
+       that  the file bar.baz was read.  (At present I don't know a way of do-
+       ing this automatically.)  Of course, if the file has a different  name,
        change bar.baz to the name of your file.
 
        g. See also the section "Advanced Configuration: Some extra resources".
@@ -1711,7 +1711,7 @@
 
 
 
-                               18 November 2022                             26
+                                7 January 2023                              26
 
 
 
@@ -1720,17 +1720,228 @@
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-       h.   Look   on   tex.stackexchange,   i.e.,   at    http://tex.stackex-
-       change.com/questions/tagged/latexmk   Someone  may  have already solved
+       h.    Look   on   tex.stackexchange,   i.e.,   at   http://tex.stackex-
+       change.com/questions/tagged/latexmk  Someone may  have  already  solved
        your problem.
 
        i. Ask a question at tex.stackexchange.com.
 
-       j. Or ask me (the author of latexmk).  My e-mail is at the end of  this
+       j.  Or ask me (the author of latexmk).  My e-mail is at the end of this
        documentation.
 
 
 
+AUXILIARY AND OUTPUT DIRECTORIES
+       Running *latex and the associated programs generate a number of  files,
+       it  is  often  convenient to arrange for the generated files to be in a
+       different directory than the source file(s) of  a  document.   For  our
+       purposes here, we identify two classes of generated file.
+
+       One class is what one may term the final output files, for example, the
+       .pdf file generated by running pdflatex, or the .dvi file  from  latex.
+       Also in this class is the ps file generated by applying dvips to a .dvi
+       file. There are also .synctec or .synctex.gz files that can be used  by
+       programs  that  display  .pdf files and the like to relate positions in
+       them to positions in source files.
+
+       The second class of file is composed  of  all  other  generated  files:
+       These  include  notably .aux files that are used for implementing cross
+       referencing, and are both generated on one run and read on a later run.
+       Many  packages  generate  yet  more such intermediate files, as well as
+       programs like bibtex, makeindex, etc.  There are also .log  files  from
+       *latex and corresponding files from other programs.
+
+       Let  us use the term "output directory" for the directory that receives
+       the final output files, and "aux directory" for the directory  for  the
+       other  generated files.  If no special options are provided to the *la-
+       tex programs, these directories default to the current  directory,  and
+       then the generated files aren't segregated.  If the two directories are
+       the same, as is the simplest situation, then all  generated  files  are
+       written  to the same directory, and one often simply refers to the out-
+       put directory, without mentioning a separate aux directory.
+
+       Support for them is provided for them in the *latex  programs:  by  the
+       single option -output-directory for the TeXLive implementations, and by
+       the options -aux-directory and -output-directory for the MiKTeX  imple-
+       mentations.  Special support like this is needed for two reasons: First
+       is that there are many packages that write files and it needs to be ar-
+       ranged  that  these are automatically written to the appropriate direc-
+       tory without any rewriting of the packages' code.  Second is  that  the
+       files  are  often read in again on subsequent runs of *latex, and it is
+       necessary that the program knows where to find the files.
+
+       A complication is that the TeXLive implementation does  not  allow  for
+       separate  aux and output directories.  Latexmk deals with this by being
+       able to emulating a separate aux directory: In this method  it  invokes
+       *latex  with  just  an -output-directory option, with the directory set
+
+
+
+                                7 January 2023                              27
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
+       not to the desired output directory, but to the aux  directory.   After
+       running  *latex,  it moves the relevant final output file(s) to the in-
+       tended output directory.  Emulation can be turned  on  by  setting  the
+       configuration  variable  $emulate_aux to one in a configuration file or
+       by using latexmk's -emulate-aux-dir option.  The emulation method works
+       equally well if MiKTeX is used.
+
+       Latexmk  also  turns  emulation on if it is found to be needed, as fol-
+       lows.  Suppose emulation is initially off, but the aux and  output  di-
+       rectories  are different.  Then latexmk invokes *latex with an -aux-di-
+       rectory option and after the run finds that it hasn't been obeyed,  no-
+       tably  because the .log file is in the output directory rather than the
+       aux directory.  Latexmk then sets emulation on, and retries.   Conceiv-
+       ably, it could move all the appropriate generated files from the output
+       directory to the aux directory; but there is such a  large  variety  of
+       possibilities for these files that this is hard to identify all of them
+       reliably except for simple cases.
+
+       Note that the emulation issue only arises when the  user  has  arranged
+       for  the  the aux and output directories to be different.  When instead
+       they are equal, e.g., because the user only set the $out_dir  variable,
+       then  latexmk  invokes  *latex  with  only an -output-directory option,
+       which works as intended with both TeXLive and MiKTeX.
+
+       In addition, latexmk arranges the invocations of any auxiliary programs
+       like bibtex and makeindex so that they will read and write the relevant
+       files from and to the aux  directory.   Programs  like  dvips,  dvipdf,
+       ps2pdf,  and xdvipdfmx are invoked so that they read from the appropri-
+       ate places and write their output to the output directory.
+
+       Files considered as final output files, i.e., those that belong in  the
+       output  directory  rather than the aux directory: These have the exten-
+       sions .dvi, .ps., .pdf, .synctex, and .synctex.gz.  A special case, be-
+       cause of compatibility issues, is of .fls files: See below.
+
+       Note  that  xelatex  when  invoked  with its -no-pdf option, as latexmk
+       does, generates an .xdv file, which would appear to have the same  sta-
+       tus  as  a  .dvi file generated by latex.  Nevertheless, latexmk treats
+       .xdv as an intermediate file that is found in the aux directory.   This
+       is  to  match MiKTeX's treatment of the -aux-directory option.  As fur-
+       ther justification, one can say that under modern  conditions  an  .xdv
+       file is (almost) always an intermediate file.  Historically, the situa-
+       tion with .dvi files from latex was different, and currently  dvi  pre-
+       viewers do exist.
+
+
+       Variables  and  options  for directories: The variables for setting the
+       aux and output directories are $aux_dir and $out_dir, with  correspond-
+       ing  command  line  options -auxdir (or -aux-directory) and -outdir (or
+       -output-directory).  When a value for these is blank (which is the  de-
+       fault  value),  it implies the use of a default: For the aux directory,
+       the default is to set it equal to the output directory.  For the output
+       directory, the default is to be the current directory.
+
+
+
+
+                                7 January 2023                              28
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
+       For the turning on and off of the emulation mode, there is the configu-
+       ration variable $emulate_aux and the  options  -emulate-aux-dir,  -emu-
+       late-aux-dir-, -noemulate-aux-dir.
+
+
+       Interaction with -cd option: When the -cd option is used (or the equiv-
+       alent setting of $do_cd variable), then latexmk changes the working di-
+       rectory  to  the document directory before invoking *latex.  If the aux
+       and/or output directories are given by relative paths, e.g.,  by  -out-
+       dir=output  for  a  directory  named "output", then the directories are
+       relative to the document directory, rather than relative to the working
+       directory that was in effect when latexmk was invoked. This matches the
+       behavior of *latex as invoked with the provided command line  directory
+       argument(s)  after  the change of working directory to the document di-
+       rectory.
+
+       Automatic creation of aux and output directories: Unlike *latex, if la-
+       texmk  finds  the  requested  directory/ies  don't  exist,  it  creates
+       it/them, thereby avoiding errors when *latex is invoked.
+
+       If the document uses the \include macro to read a .tex file from a sub-
+       directory, *latex will attempt to write an extra aux file to the corre-
+       sponding subdirectory  of  the  aux  directory.   If  the  subdirectory
+       doesn't  exist,  then  *latex will complain that it can't write the aux
+       file.  After the run of *latex, latexmk detects this situation, creates
+       the  necessary  directory,  and  reruns *latex with the error situation
+       corrected.
+
+       Choice of aux and output directories: Often the aux and output directo-
+       ries  are  given  as subdirectories of the document directory, e.g., by
+       -outdir=output. But it is possible to provide, for example, an absolute
+       path  or  a  path  relative  to a parent directory, e.g., "/tmp/foo" or
+       "../output".  Be aware that in general this can cause problems, notably
+       with  makeindex  or  bibtex.   This is because modern versions of these
+       programs, by default, will refuse to work when they find that they  are
+       asked to write to a file in a directory that appears not to be the cur-
+       rent working directory or one of its subdirectories.  This is  part  of
+       security measures by the whole TeX system that try to prevent malicious
+       or errant TeX documents from incorrectly messing with a user's files.
+
+       By default, latexmk evades this issue: Before running bibtex and  make-
+       index, latexmk changes working directory to the aux directory, with ap-
+       propriate settings of search paths.  The use or non-use of  this  trick
+       is  governed  by the variables $bibtex_fudge and $makeindex_fudge.  Un-
+       fortunately, the trick sometimes makes bibtex and makeindex  unable  to
+       find files.
+
+       If necessary the trick can be turned off. But this is incompatible with
+       an aux directory like, "/tmp/foo" of "../output").  If you really  have
+       to deal with this situation, and only if you have to deal with it, then
+       you need to disable the security measures (and assume any risks).   One
+       way of doing this is to temporarily set an operating system environment
+       variable openout_any to "a" (as in  "all"),  to  override  the  default
+       "paranoid" setting.
+
+
+
+                                7 January 2023                              29
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
+       Certain  names  of  aux and output directories not allowed on Microsoft
+       Windows: It is natural to want to use the name "aux" for the aux direc-
+       tory,  e.g., by using the option -auxdir=aux.  But on Microsoft operat-
+       ing systems "aux" is one of the names that is not allowed for a file or
+       directory.   I  find  it  useful to standardize on a name like "auxdir"
+       (e.g., by -auxdir=auxdir); this works independently of  operating  sys-
+       tem.
+
+       Location  of .fls file: Much of the dependency information that latexmk
+       uses comes from the .fls file generated when *latex is invoked with the
+       -recorder  option, which latexmk does by default.  It may seem rational
+       that this is written to the aux directory.  But  in  fact  versions  of
+       MiKTeX prior to Oct. 2020 wrote it to the output directory.  Later ver-
+       sions do write it to the aux directory.  To  deal  with  this,  latexmk
+       does  two  things:  First, if latexmk finds that the .fls file has only
+       been generated in the "wrong" directory, then latexmk copies it to  the
+       expected directory, after which latexmk's operation continues correctly
+       independently of the behavior of *latex. Second it allows its  idea  of
+       the  "correct" (or expected) directory to be configured by the variable
+       $fls_uses_aux_dir.  This defaults to zero, to  correspond  to  MiKTeX's
+       current behavior.
+
+
+
 ALLOWING FOR CHANGE OF OUTPUT FILE TYPE
        When one of the latex engines is run, the usual situation is that latex
        produces a .dvi file, while pdflatex and lualatex produce a .pdf  file.
@@ -1762,6 +1973,17 @@
        useful to force output to be of the .dvi format by  inserting  \pdfout-
        put=0 in the preamble of the document.
 
+
+
+                                7 January 2023                              30
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
        Another  example  is where the document uses graphics file of the .pdf,
        .jpg, and png types.  With the default setting for the  graphicx  pack-
        age,  these can be processed in compilation to .pdf but not with compi-
@@ -1774,18 +1996,6 @@
        of .pdf, .dvi, .xdv) and the initially expected  output,  if  possible.
        Latexmk does this provided the following conditions are met.
 
-
-
-
-                               18 November 2022                             27
-
-
-
-
-
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
        The first is that latexmk's $allow_switch configuration variable is set
        to a non-zero value as it is by default.  If this variable is  zero,  a
        mismatch of filetypes in the compilation results in an error.
@@ -1828,6 +2038,18 @@
        The
           directories are searched in the following order, and latexmk uses
           the first such file it finds (if any):
+
+
+
+                                7 January 2023                              31
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
           "/etc",
           "/opt/local/share/latexmk",
           "/usr/local/share/latexmk",
@@ -1841,17 +2063,6 @@
           "/usr/local/share/latexmk",
           "/usr/local/lib/latexmk".
 
-
-
-                               18 November 2022                             28
-
-
-
-
-
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
        If the environment variable LATEXMKRCSYS is set, its value is  used  as
        the name of the system RC file, instead of any of the above.
 
@@ -1893,6 +2104,18 @@
 
        Note that command line options are obeyed in the order  in  which  they
        are written; thus any RC file specified on the command line with the -r
+
+
+
+                                7 January 2023                              32
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
        option can override previous options but can be  itself  overridden  by
        later  options on the command line.  There is also the -e option, which
        allows initialization code to be specified in latexmk's command line.
@@ -1906,18 +2129,6 @@
        The important variables that can be configured  are  described  in  the
        section  "List  of  configuration  variables  usable  in initialization
        files".  (See the earlier  section  "Configuration/Initialization  (rc)
-
-
-
-                               18 November 2022                             29
-
-
-
-
-
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
        Files"  for  the  files where the configurations are done.)  Syntax for
        setting these variables is of the following forms:
 
@@ -1960,6 +2171,17 @@
        bilities listed here do not apply to the $kpsewhich variable;  see  its
        documentation.)
 
+
+
+                                7 January 2023                              33
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
        Placeholders:  Supposed you wanted latexmk to use the command elatex in
        place of the regular latex  command,  and  suppose  moreover  that  you
        wanted  to  give  it the option "--shell-escape".  You could do this by
@@ -1971,22 +2193,10 @@
        are  substituted by appropriate values before the command is run.  Thus
        %S will be replaced by the source file that elatex will be applied  to,
        and  %O will be replaced by any options that latexmk has decided to use
-       for this command.  (E.g.,  if  you  used  the  -silent  option  in  the
+       for this command.  (E.g., if you used the -silent option in the invoca-
+       tion  of  latexmk,   it  results in the replacement of %O by "-interac-
+       tion=batchmode".)
 
-
-
-                               18 November 2022                             30
-
-
-
-
-
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
-       invocation of latexmk,  it results in the replacement of %O by "-inter-
-       action=batchmode".)
-
        The available placeholders are:
 
        %A     basename of the main tex file.  Unlike %R, this is unaffected by
@@ -2027,6 +2237,17 @@
               substituted  for %U (appropriately quoted).  Otherwise it is re-
               placed by a null string.
 
+
+
+                                7 January 2023                              34
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
        %Y     Name of directory for auxiliary output files (see the configura-
               tion variable $aux_dir).  A directory separation character ('/')
               is appended if $aux_dir is non-empty and does not end in a suit-
@@ -2037,20 +2258,8 @@
               value $out_dir.
 
        %Z     Name  of directory for output files (see the configuration vari-
-              able $out_dir).   A  directory  separation  character  ('/')  is
-
-
-
-                               18 November 2022                             31
-
-
-
-
-
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
-              appended if $out_dir is non-empty and does not end in a suitable
+              able $out_dir).  A directory separation character ('/')  is  ap-
+              pended  if  $out_dir is non-empty and does not end in a suitable
               character, with suitable characters being those  appropriate  to
               UNIX and MS-Windows, i.e., ':', '/' and '\'.
 
@@ -2093,29 +2302,29 @@
        cludes  the  possibility  of running a command named start.  (3) If the
        word start occurs more than  once  at  the  beginning  of  the  command
        string,  that is equivalent to having just one.  (4) Under cygwin, some
-       complications happen, since cygwin amounts to a complicated merging  of
-       UNIX  and  MS-Windows.   See  the  source code for how I've handled the
-       problem.
 
-       Command names containing spaces: Under MS-Windows it is common that the
-       name of a command includes spaces, since software is often installed in
-       a subdirectory of "C:\Program Files".  Such command names should be en-
-       closed in double quotes, as in
 
-            $lpr_pdf  =  '"c:/Program  Files/Ghostgum/gsview/gsview32.exe"  /p
-       %S';
 
+                                7 January 2023                              35
 
 
-                               18 November 2022                             32
 
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+       complications happen, since cygwin amounts to a complicated merging  of
+       UNIX  and  MS-Windows.   See  the  source code for how I've handled the
+       problem.
 
+       Command names containing spaces: Under MS-Windows it is common that the
+       name of a command includes spaces, since software is often installed in
+       a subdirectory of "C:\Program Files".  Such command names should be en-
+       closed in double quotes, as in
 
+            $lpr_pdf  =  '"c:/Program  Files/Ghostgum/gsview/gsview32.exe"  /p
+       %S';
             $pdf_previewer   =   'start   "c:/Program   Files/SumatraPDF/Suma-
        traPDF.exe" %O %S';
             $pdf_previewer  =  'start "c:/Program Files/SumatraPDF (x86)/Suma-
@@ -2159,29 +2368,29 @@
        your system.  The string after the "NONE" is effectively a comment.
 
        Options to commands: Setting the name of a command can be used not only
-       for changing the name of the command called, but also to add options to
-       command.  Suppose you want latexmk to use latex  with  source  specials
-       enabled.   Then  you  might use the following line in an initialization
-       file:
 
-            $latex = 'latex --src-specials %O %S';
 
-       Running a subroutine instead of an external command: Use  a  specifica-
-       tion starting with "internal", as in
 
-            $latex = 'internal mylatex %O %S';
+                                7 January 2023                              36
 
 
 
-                               18 November 2022                             33
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+       for changing the name of the command called, but also to add options to
+       command.  Suppose you want latexmk to use latex  with  source  specials
+       enabled.   Then  you  might use the following line in an initialization
+       file:
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+            $latex = 'latex --src-specials %O %S';
 
+       Running a subroutine instead of an external command: Use  a  specifica-
+       tion starting with "internal", as in
 
+            $latex = 'internal mylatex %O %S';
             sub mylatex {
                 my @args = @_;
                 # Possible preprocessing here
@@ -2225,6 +2434,18 @@
        the MS-Windows command-line processor cmd.exe.
 
 
+
+
+
+                                7 January 2023                              37
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
 LIST OF CONFIGURATION VARIABLES USABLE IN INITIALIZATION FILES
        In this section are specified the variables whose  values  can  be  ad-
        justed  to  configure  latexmk.   (See  the earlier section "Configura-
@@ -2238,16 +2459,6 @@
        i.e., the behavior does not occur.
 
 
-
-                               18 November 2022                             34
-
-
-
-
-
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
        $allow_switch [1]
 
               This  controls  what happens when the output extension of latex,
@@ -2289,6 +2500,18 @@
 
               After  a run of latex (etc), always analyze .log for input files
               in the <...> and (...) constructions.  Otherwise,  only  do  the
+
+
+
+                                7 January 2023                              38
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
               analysis when fls file doesn't exist or is out of date.
 
               Under  normal  circumstances,  the data in the fls file is reli-
@@ -2302,18 +2525,6 @@
               doesn't  always  generate  lines  in the .fls file for input lua
               files.  (The situation with lualatex is  HIGHLY  version  depen-
               dent,  e.g.,  there  was  a  big change between TeXLive 2016 and
-
-
-
-                               18 November 2022                             35
-
-
-
-
-
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
               TeXLive 2017.)
 
               To keep backward compatibility with older versions  of  latexmk,
@@ -2324,7 +2535,7 @@
               Whether  to  automatically read the standard initialization (rc)
               files, which are the system RC file, the user's RC file, and the
               RC file in the current directory.  The command line option -norc
-              can be used to turn this setting off.  Each RC file  could  also
+              can be used to turn this setting off.  Each RC file co2uld  also
               turn  this  setting off, i.e., it could set $auto_rc_use to zero
               to prevent automatic reading of the later RC files.
 
@@ -2332,54 +2543,55 @@
               on the command line by the -r option.
 
        $aux_dir [""]
-              The directory in which auxiliary files (aux, log, etc) are to be
-              written by a run of *latex.  If this variable is  not  set,  but
-              $out_dir  is set, then $aux_dir is set to $out_dir, which is the
-              directory to which general output files are to be written.
+              The  aux directory, i.e., the directory in which auxiliary files
+              (aux, log, etc) are to be written by a run of *latex.
 
-              Important note:  The default implementation of the aux dir is to
-              give *latex the -aux-directory option.  But that only works with
-              the MiKTeX distribution, not with  the  TeX  Live  distribution.
-              Latexmk has an alternative implementation that avoids this prob-
-              lem: See the description of -emulate-aux-dir option and the $em-
-              ulate_aux variable for details.
+              If this variable is not set, but $out_dir is set,  then  latexmk
+              takes  the  aux directory to equal the output directory which is
+              the directory to which final output files are to be written.
 
-              See also the documentation of $out_dir for some complications on
-              what directory names are suitable.
+              If neither variable is set, then the current directory when *la-
+              tex is invoked is used both for the aux and output directories.
 
-              If you also use the -cd option, and $out_dir (or $aux_dir)  con-
-              tains  a relative path, then the path is interpreted relative to
-              the document directory.
+              If the aux and output directories are distinct, then the aux di-
+              rectory contains all generated files with the exception of  "fi-
+              nal  output  files",  which  are  defined to be .dvi, .ps, .pdf,
+              .synctex, and .synctex.gz files.
 
+              See the section AUXILIARY AND OUTPUT DIRECTORIES  for  more  de-
+              tails.
 
+
+
        $aux_out_dir_report [0]
-              For each .tex file processed, list the settings for aux and  out
-              directories,  after  they have been normalized from the settings
-              specified during initialization.
+              For  each primary .tex file processed, list the settings for aux
+              and output directories, after they have been normalized from the
 
-              This report gives a reminder of where to look for output.
 
-              The report has to be done per file, because of  possible  direc-
-              tory  changes  for each file.  In the simplest cases, the result
-              is the same as originally specified.  In general, e.g., with  an
-              absolute  directory  specified,  the normalization helps perfor-
-              mance and cleans up output to the screen. It also avoids  situa-
-              tions  where  a  file in the current directory is referred to by
-              different names, e.g., "file.aux" and "./file.aux", which can be
-              annoying.
 
+                                7 January 2023                              39
 
 
 
-                               18 November 2022                             36
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+              settings specified during initialization.
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+              This  report  gives  a  reminder  of where to look for generated
+              files.
 
+              The report has to be done per primary .tex file, because of pos-
+              sible  directory  changes  for each file (when the -cd option is
+              used).  In the simplest cases, the directory names are the  same
+              as  originally  specified.  But in general some clean up/normal-
+              ization is performed; this helps performance and cleans up  out-
+              put to the screen.
 
+
+
        $bad_warning_is_error [0]
               Whether  to treat bad warnings reported by *latex in log file as
               errors. The  specifications  of  the  warning  messages  are  in
@@ -2420,6 +2632,18 @@
               A decimal number that specifies how  large  the  banner  message
               will  be printed.  Experimentation is necessary to get the right
               scale for your message, as a rule of thumb the scale  should  be
+
+
+
+                                7 January 2023                              40
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
               about  equal  to 1100 divided by the number of characters in the
               message.  The Default is just right for  5  character  messages.
               This is equivalent to the -bs option.
@@ -2434,18 +2658,6 @@
               tem, of course.  Examples for setting this variable are:
 
                       @BIBINPUTS = ( ".", "C:\\bibfiles" );
-
-
-
-                               18 November 2022                             37
-
-
-
-
-
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
                       @BIBINPUTS = ( ".", "\\server\bibfiles" );
                       @BIBINPUTS = ( ".", "C:/bibfiles" );
                       @BIBINPUTS = ( ".", "//server/bibfiles" );
@@ -2455,19 +2667,22 @@
               backward slash "\" can be used to separate pathname  components,
               so  the  first  two  and the second two examples are equivalent.
               Each backward slash should be doubled to avoid running afoul  of
-              Perl's rules for writing strings.
+              Perl's  rules for writing strings. Generally, it is simplest al-
+              ways to use forward slashes instead of backward slashes.
 
               Important note: This variable is now mostly obsolete in the cur-
-              rent version of latexmk, since it has a better method of search-
-              ing  for  files  using  the kpsewhich command.  However, if your
-              system is an unusual one without the kpsewhich command, you  may
-              need to set the variable @BIBINPUTS.
+              rent  version  of  latexmk, since it now uses a better method of
+              searching for files using the kpsewhich  command.   However,  if
+              your system is an unusual one without the kpsewhich command, you
+              may need to set the variable @BIBINPUTS.
 
+
        $biber ["biber %O %S"]
               The biber processing program.
 
+
        $biber_silent_switch ["--onlylog"]
-              Switch(es)  for the biber processing program when silent mode is
+              Switch(es) for the biber processing program when silent mode  is
               on.
 
        $bibtex ["bibtex %O %S"]
@@ -2474,102 +2689,85 @@
               The BibTeX processing program.
 
        $bibtex_fudge [1]
-              When using bibtex, whether to change directory to  $aux_dir  be-
+              When  using  bibtex, whether to change directory to $aux_dir be-
               fore running bibtex.
 
               The need arises as follows:
 
-              a.  With  bibtex  before about 2019, if the filename given to it
+              a. With bibtex before about 2019, if the filename  given  to  it
               contains a path component, there was a bug that bibtex would not
-              find  extra  aux  files,  as produced by the \include command in
+              find extra aux files, as produced by  the  \include  command  in
               TeX.
 
-              b. With all moderately recent versions  of  bibtex,  bibtex  may
-              refuse to write its bbl and blg files, for security reasons, for
-              certain cases of the path component of the filename given to it.
 
-              However, there are also rare cases  where  the  change-directory
-              method  prevents  bibtex  from finding certain bib or bst files.
-              Then $bibtex_fudge needs to be set to 0.
 
+                                7 January 2023                              41
 
-       $bibtex_silent_switch ["-terse"]
-              Switch(es) for the BibTeX processing program when silent mode is
-              on.
 
-       $bibtex_use [1]
-              Under what conditions to run bibtex or biber.  When latexmk dis-
-              covers from the  log  file  that  one  (or  more)  bibtex/biber-
 
 
 
-                               18 November 2022                             38
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+              b.  With  all  moderately  recent versions of bibtex, bibtex may
+              refuse to write its bbl and blg files, for security reasons, for
+              certain cases of the path component of the filename given to it.
 
+              However,  there  are  also rare cases where the change-directory
+              method prevents bibtex from finding certain bib  or  bst  files.
+              Then $bibtex_fudge needs to be set to 0.
 
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+       $bibtex_silent_switch ["-terse"]
+              Switch(es) for the BibTeX processing program when silent mode is
+              on.
 
 
-              generated  bibliographies  are  used, it can run bibtex or biber
-              whenever it appears necessary to regenerate the bbl file(s) from
-              their  source  bib  database  file(s).   But  sometimes, the bib
+       $bibtex_use [1]
+              Under what conditions to run bibtex or biber.  When latexmk dis-
+              covers  from the log file that one (or more) bibtex/biber-gener-
+              ated bibliographies are used, it can run bibtex or  biber  when-
+              ever  it  appears  necessary  to regenerate the bbl file(s) from
+              their source bib  database  file(s).   But  sometimes,  the  bib
               file(s) are not available (e.g., for a document obtained from an
               external archive), but the bbl files are provided.  In that case
-              use of bibtex or biber will result in incorrect  overwriting  of
-              the  precious  bbl  files.   The  variable  $bibtex_use controls
-              whether this happens, and also  controls  whether  or  not  .bbl
+              use  of  bibtex or biber will result in incorrect overwriting of
+              the precious  bbl  files.   The  variable  $bibtex_use  controls
+              whether  this  happens,  and  also  controls whether or not .bbl
               files are deleted in a cleanup operation.
 
               The possible values of $bibtex_use are:
-                0:  never  use  bibtex  or biber; never delete .bbl files in a
+                0: never use bibtex or biber; never delete  .bbl  files  in  a
               cleanup.
                 1: only use bibtex if the bib file(s) exist; never delete .bbl
               files in a cleanup.
-                1.5:  only  use  bibtex  if the bib files exist; conditionally
-              delete .bbl files in a cleanup (i.e., delete them only when  the
+                1.5: only use bibtex if the  bib  files  exist;  conditionally
+              delete  .bbl files in a cleanup (i.e., delete them only when the
               bib files all exist).
                 2: run bibtex or biber whenever it appears necessary to update
-              the bbl file(s), without testing for the existence  of  the  bib
+              the  bbl  file(s),  without testing for the existence of the bib
               files; always delete .bbl files in a cleanup.
 
-              Important  note:  Currently,  the  values  1 and 1.5 do not work
-              properly if the document uses  biber  instead  of  bibtex.  When
-              biber  is used, the values 1 and 1.5 for $bibtex_use are equiva-
-              lent to 2 as regards the running  of  biber.   (There's  a  long
-              story  why  not.   Basically,  the problem is that when biber is
-              used, latexmk only knows the names and status  of  the  bibfiles
-              after  running biber.  In contrast, when bibtex is used, the in-
-              formation is available after a run of *latex. It  is  a  problem
-              for the future to correct this.)
 
-
        $cleanup_includes_cusdep_generated [0]
-              If  nonzero,  specifies that cleanup also deletes files that are
+              If nonzero, specifies that cleanup also deletes files  that  are
               generated by custom dependencies.  (When doing a clean up, e.g.,
               by use of the -C option, custom dependencies are those listed in
               the .fdb_latexmk file from a previous run.)
 
+
        $cleanup_includes_generated [0]
-              If nonzero, specifies that cleanup also deletes files  that  are
+              If  nonzero,  specifies that cleanup also deletes files that are
               detected in the fls file (or failing that, in log file) as being
-              generated.  It will also include files  made  from  these  first
+              generated.   It  will  also  include files made from these first
               generation generated files.
 
-              This  operation  is  somewhat dangerous, and can have unintended
-              consequences, since the files to be deleted are determined  from
-              a  file  created by *latex, which can contain erroneous informa-
-              tion. Therefore this variable is turned off by default, and then
-              files to be deleted are restricted to those explicitly specified
-              by   patterns   configured   in   the    variables    clean_ext,
-              clean_full_ext, and @generated_exts.  Standard cases (e.g., .log
-              files) appear in latexmk's initial value for the  array  @gener-
-              ated_exts.
+              This operation is somewhat dangerous, and  can  have  unintended
 
 
 
-                               18 November 2022                             39
+                                7 January 2023                              42
 
 
 
@@ -2578,20 +2776,29 @@
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+              consequences,  since the files to be deleted are determined from
+              a file created by *latex, which can contain  erroneous  informa-
+              tion. Therefore this variable is turned off by default, and then
+              files to be deleted are restricted to those explicitly specified
+              by    patterns    configured   in   the   variables   clean_ext,
+              clean_full_ext, and @generated_exts.  Standard cases (e.g., .log
+              files)  appear  in latexmk's initial value for the array @gener-
+              ated_exts.
+
        $cleanup_mode [0]
-              If  nonzero,  specifies  cleanup mode: 1 for full cleanup, 2 for
-              cleanup except for .dvi, .ps and .pdf files, 3 for  cleanup  ex-
-              cept  for  dep  and aux files.  (There is also extra cleaning as
+              If nonzero, specifies cleanup mode: 1 for full  cleanup,  2  for
+              cleanup  except  for .dvi, .ps and .pdf files, 3 for cleanup ex-
+              cept for dep and aux files.  (There is also  extra  cleaning  as
               specified by the $clean_ext, $clean_full_ext and @generated_exts
               variables.)
 
-              This  variable  is  equivalent to specifying one of the -c or -C
-              options.  But there should be no need to set this variable  from
+              This variable is equivalent to specifying one of the  -c  or  -C
+              options.   But there should be no need to set this variable from
               an RC file.
 
        $clean_ext [""]
-              Extra  extensions of files for latexmk to remove when any of the
-              clean-up options (-c or -C) is  selected.   The  value  of  this
+              Extra extensions of files for latexmk to remove when any of  the
+              clean-up  options  (-c  or  -C)  is selected.  The value of this
               variable is a string containing the extensions separated by spa-
               ces.
 
@@ -2603,62 +2810,62 @@
               files-%R/*";
 
               in an initialization file will imply that when a clean-up opera-
-              tion is specified,  not  only  is  the  standard  set  of  files
-              deleted,  but  also files of the form FOO.out, FOO-blx.bib, FOO-
-              figures*.log, and pythontex-files-FOO/*, where  FOO  stands  for
+              tion  is  specified,  not  only  is  the  standard  set of files
+              deleted, but also files of the form FOO.out,  FOO-blx.bib,  FOO-
+              figures*.log,  and  pythontex-files-FOO/*,  where FOO stands for
               the basename of the file being processed (as in FOO.tex).
 
-              Most  of  the  files to be deleted are relative to the directory
-              specified by $aux_dir.  Note that if $out_dir but  not  $aux_dir
-              is  set, then in its initialization, latexmk sets $aux_dir equal
-              to $out_dir.  A normal  situation  is  therefore  that  $aux_dir
-              equals  $out_dir,  which  is the only case directly supported by
-              TeXLive, unlike MiKTeX.  Note that  even  with  TeXLive  latexmk
+              Most of the files to be deleted are relative  to  the  directory
+              specified  by  $aux_dir.  Note that if $out_dir but not $aux_dir
+              is set, then in its initialization, latexmk sets $aux_dir  equal
+              to  $out_dir.   A  normal  situation  is therefore that $aux_dir
+              equals $out_dir, which is the only case  directly  supported  by
+              TeXLive,  unlike  MiKTeX.   Note  that even with TeXLive latexmk
               does now support different values for the directories -- see the
               explanation of the $emulate_aux variable.
 
               If $out_dir and $aux_dir different, latexmk actually deletes any
               files of the specified names in both $aux_dir and $out_dir; this
-              is because under certain error conditions, the files may be  put
-              in  $out_dir instead of $aux_dir.  This also handles the case of
+              is  because under certain error conditions, the files may be put
+              in $out_dir instead of $aux_dir.  This also handles the case  of
               deleting any fls file, since that file is in $out_dir.
 
-              The filenames specified for a clean-up operation can  refer  not
-              only  to regular files but also to directories.  Directories are
-              only deleted if they are empty.  An example of an application is
-              to  pythontex,  which  creates  files in a particular directory.
-              You can arrange to remove both the files and  the  directory  by
-              setting
 
-                  $clean_ext = "pythontex-files-%R pythontex-files-%R";
 
 
+                                7 January 2023                              43
 
 
-                               18 November 2022                             40
 
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+              The  filenames  specified for a clean-up operation can refer not
+              only to regular files but also to directories.  Directories  are
+              only deleted if they are empty.  An example of an application is
+              to pythontex, which creates files  in  a  particular  directory.
+              You  can  arrange  to remove both the files and the directory by
+              setting
 
+                  $clean_ext = "pythontex-files-%R pythontex-files-%R";
 
-              See  also  the  (array)  variable @generated_exts.  In the past,
-              this variable had certain uses beyond that of  $clean_ext.   But
-              now,  they  accomplish the same things.  In fact, after initial-
-              ization including the processing of command  line  options,  la-
+              See also the (array) variable  @generated_exts.   In  the  past,
+              this  variable  had certain uses beyond that of $clean_ext.  But
+              now, they accomplish the same things.  In fact,  after  initial-
+              ization  including  the  processing of command line options, la-
               texmk simply appends the list of extensions in $clean_ext to the
               array @generated_exts.
 
        $clean_full_ext [""]
-              Extra extensions of files for latexmk to remove when the -C  op-
-              tion  is  selected, i.e., extensions of files to remove when the
+              Extra  extensions of files for latexmk to remove when the -C op-
+              tion is selected, i.e., extensions of files to remove  when  the
               .dvi, etc files are to be cleaned-up.
 
               More general patterns are allowed, as for $clean_ext.
 
-              The files specified by $clean_full_ext to be deleted  are  rela-
+              The  files  specified by $clean_full_ext to be deleted are rela-
               tive to the directory specified by $out_dir.
 
 
@@ -2665,75 +2872,75 @@
        $compiling_cmd [""], $failure_cmd [""], $warning_cmd [""], $success_cmd
        [""]
 
-              These variables specify commands that are  executed  at  certain
-              points  of  compilations.  One motivation for their existence is
-              to allow very useful convenient visual indications  of  compila-
-              tion  status even when the window receiving the screen output of
-              the compilation is hidden.  This is particularly useful in  pre-
+              These  variables  specify  commands that are executed at certain
+              points of compilations.  One motivation for their  existence  is
+              to  allow  very useful convenient visual indications of compila-
+              tion status even when the window receiving the screen output  of
+              the  compilation is hidden.  This is particularly useful in pre-
               view-continuous mode.
 
-              The  commands  are  executed  at  the following points: $compil-
-              ing_cmd at the start of compilation, $success_cmd at the end  of
-              a  completely successful compilation, $failure_cmd at the end of
+              The commands are executed  at  the  following  points:  $compil-
+              ing_cmd  at the start of compilation, $success_cmd at the end of
+              a completely successful compilation, $failure_cmd at the end  of
               an unsuccessful compilation, $warning_cmd at the of an otherwise
               successful compilation that gives warnings about undefined cita-
               tions or references or about multiply defined references. If any
-              of  above  variables  is  undefined or blank (the default situa-
+              of above variables is undefined or  blank  (the  default  situa-
               tion), then the corresponding command is not executed.
 
-              However, when $warning_cmd is not set, then in  the  case  of  a
-              compilation  with  warnings  about  references or citations, but
-              with no other error, one or  other  of  $success_cmd  or  $fail-
-              ure_cmd  is  used  (if  it  is  set) according to the setting of
+              However,  when  $warning_cmd  is  not set, then in the case of a
+              compilation with warnings about  references  or  citations,  but
+              with  no  other  error,  one  or other of $success_cmd or $fail-
+              ure_cmd is used (if it is  set)  according  to  the  setting  of
               $warnings_as_errors.
 
               An example of a simple setting of these variables is as follows
 
-                  $compiling_cmd = "xdotool search  --name  \"%D\"  set_window
-              --name \"%D compiling\"";
-                  $success_cmd    =  "xdotool  search --name \"%D\" set_window
-              --name \"%D OK\"";
-                  $warning_cmd   = "xdotool search --name \"%D\" ".
-                                   "set_window --name \"%D CITE/REF ISSUE\"";
-                  $failure_cmd   = "xdotool search  --name  \"%D\"  set_window
-              --name \"%D FAILURE\"";
 
 
 
+                                7 January 2023                              44
 
-                               18 November 2022                             41
 
 
 
 
-
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-              These  assume  that  the  program xdotool is installed, that the
-              previewer is using an X-Window system for display, and that  the
-              title  of the window contains the name of the displayed file, as
-              it normally does.  When the commands are  executed,  the  place-
-              holder  string  %D  is  replaced  by the name of the destination
+                  $compiling_cmd  =  "xdotool  search --name \"%D\" set_window
+              --name \"%D compiling\"";
+                  $success_cmd   = "xdotool search  --name  \"%D\"  set_window
+              --name \"%D OK\"";
+                  $warning_cmd   = "xdotool search --name \"%D\" ".
+                                   "set_window --name \"%D CITE/REF ISSUE\"";
+                  $failure_cmd    =  "xdotool  search --name \"%D\" set_window
+              --name \"%D FAILURE\"";
+
+              These assume that the program xdotool  is  installed,  that  the
+              previewer  is using an X-Window system for display, and that the
+              title of the window contains the name of the displayed file,  as
+              it  normally  does.   When the commands are executed, the place-
+              holder string %D is replaced by  the  name  of  the  destination
               file, which is the previewed file.  The above commands result in
               an appropriate string being appended to the filename in the win-
               dow title: " compiling", " OK", or " FAILURE".
 
-              Other placeholders that can be used are %S, %T, and %R, with  %S
-              and  %T normally being identical. These can be useful for a com-
-              mand changing the title of the edit window. The  visual  indica-
-              tion  in a window title can useful, since the user does not have
-              to keep shifting attention to the (possibly hidden)  compilation
+              Other  placeholders that can be used are %S, %T, and %R, with %S
+              and %T normally being identical. These can be useful for a  com-
+              mand  changing  the title of the edit window. The visual indica-
+              tion in a window title can useful, since the user does not  have
+              to  keep shifting attention to the (possibly hidden) compilation
               window to know the status of the compilation.
 
-              More  complicated  situations  can best be handled by defining a
-              Perl subroutine to invoke the necessary commands, and using  the
-              "internal"  keyword  in the definitions to get the subroutine to
+              More complicated situations can best be handled  by  defining  a
+              Perl  subroutine to invoke the necessary commands, and using the
+              "internal" keyword in the definitions to get the  subroutine  to
               be invoked.  (See the section "Format of Command Specifications"
               for how to do this.)
 
-              Naturally,  the  above  settings that invoke the xdotool program
-              are only applicable when the X-Window system  is  used  for  the
+              Naturally, the above settings that invoke  the  xdotool  program
+              are  only  applicable  when  the X-Window system is used for the
               relevant window(s).  For other cases, you will have to find what
               software solutions are available.
 
@@ -2742,40 +2949,39 @@
               Custom dependency list -- see section on "Custom Dependencies".
 
        @default_excluded_files [()]
-              When latexmk is invoked with no files specified on  the  command
+              When  latexmk  is invoked with no files specified on the command
               line, then, by default, it will process all files in the current
               directory with the extension .tex.  (In general, it will process
               the files specified in the @default_files variable.)
 
               But sometimes you want to exclude particular files from this de-
-              fault list.  In that case you can specify the excluded files  in
+              fault  list.  In that case you can specify the excluded files in
               the array @default_excluded_files.  For example if you wanted to
-              process all .tex files with the exception of  common.tex,  which
+              process  all  .tex files with the exception of common.tex, which
               is a not a standard alone LaTeX file but a file input by some or
               all of the others, you could do
 
                    @default_files = ("*.tex");
 
-                   @default_excluded_files = ("common.tex");
 
-              If you have a variable or large number of files to be processed,
-              this method saves you from having to list them in detail in @de-
-              fault_files and having to update the list every time you  change
-              the set of files to be processed.
 
-              Notes:  1.  This variable has no effect except when no files are
+                                7 January 2023                              45
 
 
 
-                               18 November 2022                             42
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+                   @default_excluded_files = ("common.tex");
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+              If you have a variable or large number of files to be processed,
+              this method saves you from having to list them in detail in @de-
+              fault_files  and having to update the list every time you change
+              the set of files to be processed.
 
-
+              Notes: 1. This variable has no effect except when no  files  are
               specified on the latexmk command line.  2. Wildcards are allowed
               in @default_excluded_files.
 
@@ -2782,16 +2988,16 @@
        @default_files [("*.tex")]
               Default list of files to be processed.
 
-              If  no filenames are specified on the command line, latexmk pro-
-              cesses all tex files specified in the  @default_files  variable,
-              which  by  default is set to all tex files ("*.tex") in the cur-
-              rent directory.  This is a convenience: just run latexmk and  it
-              will  process  an  appropriate  set of files.  But sometimes you
+              If no filenames are specified on the command line, latexmk  pro-
+              cesses  all  tex files specified in the @default_files variable,
+              which by default is set to all tex files ("*.tex") in  the  cur-
+              rent  directory.  This is a convenience: just run latexmk and it
+              will process an appropriate set of  files.   But  sometimes  you
               want only some of these files to be processed.  In this case you
-              can  list the files to be processed by setting @default_files in
-              an initialization file (e.g., the file "latexmkrc" in  the  cur-
-              rent  directory).  Then if no files are specified on the command
-              line then the files you specify by  setting  @default_files  are
+              can list the files to be processed by setting @default_files  in
+              an  initialization  file (e.g., the file "latexmkrc" in the cur-
+              rent directory).  Then if no files are specified on the  command
+              line  then  the  files you specify by setting @default_files are
               processed.
 
               Three examples:
@@ -2802,49 +3008,50 @@
 
                    @default_files = ("*.tex", "*.dtx");
 
-              Note  that more than file may be given, and that the default ex-
+              Note that more than file may be given, and that the default  ex-
               tension is ".tex".  Wild cards are allowed.  The parentheses are
               because @default_files is an array variable, i.e., a sequence of
               filename specifications is possible.
 
-              If you want latexmk to process all .tex files with a few  excep-
+              If  you want latexmk to process all .tex files with a few excep-
               tions, see the @default_excluded_files array variable.
 
        $dependents_phony [0]
-              If  a  list  of dependencies is output, this variable determines
-              whether to include a phony target for each source file.  If  you
-              use  the  dependents  list  in  a Makefile, the dummy rules work
-              around errors make gives if you remove header files without  up-
+              If a list of dependencies is output,  this  variable  determines
+              whether  to include a phony target for each source file.  If you
+              use the dependents list in a  Makefile,  the  dummy  rules  work
+              around  errors make gives if you remove header files without up-
               dating the Makefile to match.
 
        $dependents_list [0]
-              Whether  to  display  a  list(s) of dependencies at the end of a
+              Whether to display a list(s) of dependencies at  the  end  of  a
               run.
 
-       $deps_file ["-"]
-              Name of file to receive list(s) of dependencies at the end of  a
-              run,  to be used if $dependesnt_list is set.  If the filename is
-              "-", then the dependency list is set to stdout  (i.e.,  normally
-              the screen).
 
 
-       $do_cd [0]
-              Whether  to  change working directory to the directory specified
 
 
+                                7 January 2023                              46
 
-                               18 November 2022                             43
 
 
 
 
-
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-              for the main source file before processing it.  The default  be-
-              havior  is  not to do this, which is the same as the behavior of
-              *latex programs.  This variable is set by the -cd and  -cd-  op-
+       $deps_file ["-"]
+              Name  of file to receive list(s) of dependencies at the end of a
+              run, to be used if $dependesnt_list is set.  If the filename  is
+              "-",  then  the dependency list is set to stdout (i.e., normally
+              the screen).
+
+
+       $do_cd [0]
+              Whether to change working directory to the  directory  specified
+              for  the main source file before processing it.  The default be-
+              havior is not to do this, which is the same as the  behavior  of
+              *latex  programs.   This variable is set by the -cd and -cd- op-
               tions on latexmk's command line.
 
        $dvi_filter [empty]
@@ -2853,522 +3060,477 @@
 
 
        $dvilualatex ["dvilualatex %O %S"]
-              Specifies the command line to invoke  the  dvilualatex  program.
-              Note  that as with other programs, you can use this variable not
-              just to change the name of the program used,  but  also  specify
+              Specifies  the  command  line to invoke the dvilualatex program.
+              Note that as with other programs, you can use this variable  not
+              just  to  change  the name of the program used, but also specify
               options to the program.  E.g.,
 
-                                  $dvilualatex  =  "dvilualatex --src-specials
+                                  $dvilualatex =  "dvilualatex  --src-specials
               %O %S";
 
-              To do a coordinated setting  of  all  of  $dvilualatex,  $latex,
-              $pdflatex,  $lualatex,  and  $xelatex, see the section "Advanced
+              To  do  a  coordinated  setting  of all of $dvilualatex, $latex,
+              $pdflatex, $lualatex, and $xelatex, see  the  section  "Advanced
               Configuration".
 
 
        $dvi_mode [See below for default]
-              If one, generate a dvi version of the document by use of  latex.
+              If  one, generate a dvi version of the document by use of latex.
               Equivalent to the -dvi option.
 
               If 2, generate a dvi version of the document by use of dviluala-
               tex.  Equivalent to the -dvilua option.
 
-              The variable $dvi_mode defaults to 0, but  if  no  explicit  re-
-              quests  are made for other types of file (postscript, pdf), then
-              $dvi_mode will be set to 1.  In addition, if  a  request  for  a
-              file  for  which  a .dvi file is a prerequisite and $dvi_mode is
+              The  variable  $dvi_mode  defaults  to 0, but if no explicit re-
+              quests are made for other types of file (postscript, pdf),  then
+              $dvi_mode  will  be  set  to 1.  In addition, if a request for a
+              file for which a .dvi file is a prerequisite  and  $dvi_mode  is
               zero, then $dvi_mode is set to 1.
 
 
 
        $dvilualatex_silent_switch ["-interaction=batchmode"]
-              Switch(es) for the dvilualatex program (specified in  the  vari-
+              Switch(es)  for  the dvilualatex program (specified in the vari-
               able $dvilualatex) when silent mode is on.
 
-              See  details  of  the $latex_silent_switch for other information
+              See details of the $latex_silent_switch  for  other  information
               that equally applies to $dvilualatex_silent_switch.
 
 
-       $dvi_previewer ["start xdvi %O %S" under UNIX]
-              The command to invoke a dvi-previewer.   [Under  MS-Windows  the
-              default  is "start"; then latexmk arranges to use the MS-Windows
-              start program, which will cause to be run whatever  command  the
-              system has associated with .dvi files.]
 
-              Important  note:  Normally you will want to have a previewer run
+                                7 January 2023                              47
 
 
 
-                               18 November 2022                             44
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+       $dvi_previewer ["start xdvi %O %S" under UNIX]
+              The  command  to  invoke a dvi-previewer.  [Under MS-Windows the
+              default is "start"; then latexmk arranges to use the  MS-Windows
+              start  program,  which will cause to be run whatever command the
+              system has associated with .dvi files.]
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
+              Important note: Normally you will want to have a  previewer  run
               detached, so that latexmk doesn't wait for the previewer to ter-
-              minate  before continuing its work.  So normally you should pre-
-              fix the command by "start ", which  flags  to  latexmk  that  it
-              should  do  the  detaching  of the previewer itself (by whatever
-              method is appropriate to the operating system).   But  sometimes
+              minate before continuing its work.  So normally you should  pre-
+              fix  the  command  by  "start  ", which flags to latexmk that it
+              should do the detaching of the  previewer  itself  (by  whatever
+              method  is  appropriate to the operating system).  But sometimes
               letting latexmk do the detaching is not appropriate (for a vari-
-              ety of non-trivial reasons), so you should put the "start "  bit
+              ety  of non-trivial reasons), so you should put the "start " bit
               in yourself, whenever it is needed.
 
        $dvi_previewer_landscape ["start xdvi %O %S"]
               The command to invoke a dvi-previewer in landscape mode.  [Under
-              MS-Windows the default is "start"; then latexmk arranges to  use
-              the  MS-Windows  start program, which will cause to be run what-
+              MS-Windows  the default is "start"; then latexmk arranges to use
+              the MS-Windows start program, which will cause to be  run  what-
               ever command the system has associated with .dvi files.]
 
        $dvipdf ["dvipdf -dALLOWPSTRANSPARENCY %O %S %D"]
-              Command to convert .dvi to .pdf file.  A common  reconfiguration
-              is  to  use  the dvipdfm command, which needs its arguments in a
+              Command  to convert .dvi to .pdf file.  A common reconfiguration
+              is to use the dvipdfm command, which needs its  arguments  in  a
               different order:
 
                    $dvipdf = "dvipdfm %O -o %D %S";
 
-              WARNING: The default dvipdf  script  generates  pdf  files  with
+              WARNING:  The  default  dvipdf  script  generates pdf files with
               bitmapped fonts, which do not look good when viewed by acroread.
-              That script should be modified to give  dvips  the  options  "-P
+              That  script  should  be  modified to give dvips the options "-P
               pdf" to ensure that type 1 fonts are used in the pdf file.
 
        $dvipdf_silent_switch ["-q"]
               Switch(es) for dvipdf program when silent mode is on.
 
-              N.B.  The  standard  dvipdf program runs silently, so adding the
-              silent switch has no effect, but is actually innocuous.  But  if
-              an  alternative program is used, e.g., dvipdfmx, then the silent
-              switch has an  effect.   The  default  setting  is  correct  for
+              N.B. The standard dvipdf program runs silently,  so  adding  the
+              silent  switch has no effect, but is actually innocuous.  But if
+              an alternative program is used, e.g., dvipdfmx, then the  silent
+              switch  has  an  effect.   The  default  setting  is correct for
               dvipdfm and dvipdfmx.
 
        $dvips ["dvips %O -o %D %S"]
-              The  program to used as a filter to convert a .dvi file to a .ps
-              file.  If pdf is going to be generated from pdf, then the  value
-              of  the  $dvips_pdf_switch  variable -- see below -- will be in-
+              The program to used as a filter to convert a .dvi file to a  .ps
+              file.   If pdf is going to be generated from pdf, then the value
+              of the $dvips_pdf_switch variable -- see below --  will  be  in-
               cluded in the options substituted for "%O".
 
        $dvips_landscape ["dvips -tlandscape %O -o %D %S"]
-              The program to used as a filter to convert a .dvi file to a  .ps
+              The  program to used as a filter to convert a .dvi file to a .ps
               file in landscape mode.
 
-       $dvips_pdf_switch ["-P pdf"]
-              Switch(es)  for  dvips  program when pdf file is to be generated
-              from .ps file.
 
-       $dvips_silent_switch ["-q"]
-              Switch(es) for dvips program when silent mode is on.
 
 
 
+                                7 January 2023                              48
 
 
-                               18 November 2022                             45
 
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+       $dvips_pdf_switch ["-P pdf"]
+              Switch(es) for dvips program when pdf file is  to  be  generated
+              from .ps file.
 
+       $dvips_silent_switch ["-q"]
+              Switch(es) for dvips program when silent mode is on.
 
        $dvi_update_command [""]
-              When the dvi previewer is set to be updated by  running  a  com-
-              mand,  this is the command that is run.  See the information for
+              When  the  dvi  previewer is set to be updated by running a com-
+              mand, this is the command that is run.  See the information  for
               the variable $dvi_update_method for further information, and see
-              information  on  the  variable $pdf_update_method for an example
+              information on the variable $pdf_update_method  for  an  example
               for the analogous case of a pdf previewer.
 
        $dvi_update_method [2 under UNIX, 1 under MS-Windows]
-              How the dvi viewer updates its display when  the  dvi  file  has
-              changed.    The  values  here  apply  equally  to  the  $pdf_up-
+              How  the  dvi  viewer  updates its display when the dvi file has
+              changed.   The  values  here  apply  equally  to  the   $pdf_up-
               date_method and to the $ps_update_method variables.
                   0 => update is automatic,
                   1=> manual update by user, which may only mean a mouse click
               on the viewer's window or may mean a more serious action.
-                  2  =>  Send  the  signal,  whose  number  is in the variable
-              $dvi_update_signal.  The default value under  UNIX  is  suitable
+                  2 => Send the  signal,  whose  number  is  in  the  variable
+              $dvi_update_signal.   The  default  value under UNIX is suitable
               for xdvi.
-                  3  => Viewer cannot do an update, because it locks the file.
+                  3 => Viewer cannot do an update, because it locks the  file.
               (As with acroread under MS-Windows.)
-                  4 => run a command to do the update.  The command is  speci-
+                  4  => run a command to do the update.  The command is speci-
               fied by the variable $dvi_update_command.
 
-              See  information on the variable $pdf_update_method for an exam-
+              See information on the variable $pdf_update_method for an  exam-
               ple of updating by command.
 
-       $dvi_update_signal [Under UNIX: SIGUSR1, which  is  a  system-dependent
+       $dvi_update_signal  [Under  UNIX:  SIGUSR1, which is a system-dependent
        value]
-              The  number of the signal that is sent to the dvi viewer when it
-              is updated by sending a signal -- see  the  information  on  the
-              variable  $dvi_update_method.   The default value is the one ap-
+              The number of the signal that is sent to the dvi viewer when  it
+              is  updated  by  sending  a signal -- see the information on the
+              variable $dvi_update_method.  The default value is the  one  ap-
               propriate for xdvi on a UNIX system.
 
        $emulate_aux [0]
-              Whether to emulate the use of aux_dir when $aux_dir and $out_dir
-              are  different,  rather than using the -aux-directory option for
-              the  *latex  programs.   (MiKTeX  supports  -aux-directory,  but
-              TeXLive doesn't.)
+              Whether  to  emulate  the use of aux directory when $aux_dir and
+              $out_dir are different, rather than using the -aux-directory op-
+              tion  for the *latex programs.  (MiKTeX supports -aux-directory,
+              but TeXLive doesn't.)
 
-              If  you use a version of *latex that doesn't support -aux-direc-
-              tory, e.g., TeXLive, latexmk will automatically  switch  aux_dir
+              If you use a version of *latex that doesn't support  -aux-direc-
+              tory,  e.g.,  TeXLive, latexmk will automatically switch aux_dir
               emulation on after the first run of *latex, because it will find
               the .log file in the wrong place.  But it is better to set $emu-
-              late_aux  to  1  in an rc file, or equivalently to use the -emu-
+              late_aux to 1 in an rc file, or equivalently to  use  the  -emu-
               late-aux-dir option. This emulation mode works equally well with
               MiKTeX.
 
-              Aux_directory  emulation  means that when *latex is invoked, the
-              output directory provided to *latex is set to  be  the  aux_dir.
-              After  that,  any  files that need to be in the output directory
-              will be moved there. (These are the files with extensions  .dvi,
-              .ps, .pdf, .fls, .synctex, .synctex.gz.)
+              Aux directory emulation means that when *latex is  invoked,  the
 
 
 
+                                7 January 2023                              49
 
 
 
-                               18 November 2022                             46
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+              output directory provided to *latex is set to be the desired aux
+              directory. After that, any files that need to be in  the  output
+              directory  will  be moved there by latexmk. (These are the files
+              with extensions .dvi, .ps, .pdf, .synctex, .synctex.gz, and, de-
+              pending  on  the setting of the $fls_uses_out_dir variable, also
+              the .fls file.)
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
-
        $failure_cmd [undefined]
               See the documentation for $compiling_cmd.
 
+
        $fdb_ext ["fdb_latexmk"]
-              The  extension  of the file which latexmk generates to contain a
-              database of information on source files.  You will not  normally
+              The extension of the file which latexmk generates to  contain  a
+              database  of information on source files.  You will not normally
               need to change this.
 
-       $filetime_causality_threshold   [5];  $filetime_offset_report_threshold
-       [30]. (Units of seconds.)
 
-              These variables control how latexmk deals with the following is-
-              sue,  which  can  affect  the  use of files that are on a remote
-              filesystem (network share) instead of being on a file system lo-
-              cal to the computer running latexmk.  Almost users will not have
-              to worry about these settings, and can ignore the following  ex-
-              planation.
+       $fls_uses_out_dir [0]
+              This variable determines whether or not the .fls file should  be
+              in  the output directory instead of the natural directory, which
+              is the aux directory.  If the variable is nonzero, the .fls file
+              is to be in the output directory.  See the section AUXILIARY AND
+              OUTPUT DIRECTORIES for more  details  about  these  directories.
+              The    rationale    for    the   existence   of   the   variable
+              $fls_uses_aux_dir is explained there.
 
-              In  almost all situations, latexmk does not need to use the time
-              stamps of the files it works with.  However, there are a  couple
-              of  situations  when it needs to know whether a certain file was
-              created in the current run of a program (e.g., *latex) or  is  a
-              leftover file from a previous run. It does this by comparing the
-              modification time of the file with the system time  just  before
-              the  program  was  started.  If the modification time is earlier
-              than when the program was started, the file is a leftover  file,
-              which latexmk treats as if it were not created.  If the filetime
-              is at least the program start time, then it can be assumed  that
-              the file was created in the current run.
+              In all cases, if latexmk finds that an .fls file has been gener-
+              ated   in  the  opposite  directory  to  the  one  specified  by
+              $fls_uses_out_dir, it copies the file  to  the  other  directory
+              (aux  or  output  directory as appropriate).  The file is copied
+              rather than simply moved, to avoid potential clashes with  other
+              software  that  assumes the .fls file is generated in the direc-
+              tory it was written to by *latex. Thus the effect  an  incorrect
+              setting of $fls_uses_out_dir is only to cause a superfluous copy
+              of the .fls file to be generated.
 
-              Unfortunately,  this  test  can  fail if the file is on a remote
-              system, since its system time is  not  necessarily  synchronized
-              with  that  of  the  local  system; the timestamps on the remote
-              files are set by the remote system, not the local system.   Gen-
-              erally,  modern  operating  systems  regularly synchronize their
-              time with a server, so the non-synchronization is  mostly  small
-              (a second or so, or a few seconds).  But even a small difference
-              can mess up latexmk's test.
 
-              Latexmk measures the time difference between the time on the two
-              systems  and  compensates  for  this.  But the measurement (in a
-              system-independent way) is only accurate to a second or two.  So
-              latexmk  allows  for  a threshold on the difference between file
-              and system time before it concludes that a file  is  a  leftover
-              file  from  a  previous  run.  The configuration variable $file-
-              time_causality_theshhold, which in units of  seconds,  specifies
-              this threshold.  Luckily high precision is not needed.  The pre-
-              vious run is normally the previous run in a  human  run-edit-run
-              cycle,  and  is  at  least  many seconds back.  A few seconds is
-              therefore  appropriate  for  the  threshold,   $filetime_causal-
-              ity_theshhold;  it  should be non-negative always, and should be
-              bigger than 2 if a remote filesystem or network share is used.
+       $force_mode [0]
+              If nonzero, continue processing past minor latex errors  includ-
+              ing unrecognized cross references.  Equivalent to specifying the
+              -f option.
 
-              If the difference in system times on the two systems  is  large,
 
+       @generated_exts [( 'aux', 'bcf', 'fls',  'idx',  'ind',  'lof',  'lot',
+       'out', 'toc', 'blg', 'ilg', 'log', 'xdv' )]
 
+              This  contains a list of extensions for files that are generated
+              during processing, and that should  be  deleted  during  a  main
+              clean  up  operation,  as invoked by the command line option -c.
+              (The use of -C or -gg gives this clean up and more.)
 
-                               18 November 2022                             47
+              The default values are extensions for standard  files  generated
+              by  *latex,  bibtex, and the like.  (Note that the clean up also
 
 
 
+                                7 January 2023                              50
 
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-              it  normally  indicates that at least one of the systems is mis-
-              configured.   The   variable   $filetime_offset_report_threshold
-              specifies  the  smallest  size  of the difference (or offset) in
-              seconds between the times of the local and remote system  beyond
-              which  the offset is reported.  This is reported at the point in
-              the latexmk's progress that it measures the offset.  The  report
-              is made if silent mode is used and diagnostic mode is not on.
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
-       $force_mode [0]
-              If  nonzero, continue processing past minor latex errors includ-
-              ing unrecognized cross references.  Equivalent to specifying the
-              -f option.
 
-
-       @generated_exts  [(  'aux',  'bcf',  'fls', 'idx', 'ind', 'lof', 'lot',
-       'out', 'toc', 'blg', 'ilg', 'log', 'xdv' )]
-
-              This contains a list of extensions for files that are  generated
-              during  processing,  and  that  should  be deleted during a main
-              clean up operation, as invoked by the command  line  option  -c.
-              (The use of -C or -gg gives this clean up and more.)
-
-              The  default  values are extensions for standard files generated
-              by *latex, bibtex, and the like.  (Note that the clean  up  also
-              deletes  the  fdb_latexmk file, but that's separately coded into
+              deletes the fdb_latexmk file, but that's separately  coded  into
               latexmk, currently.)
 
-              After initialization of latexmk and the processing of  its  com-
-              mand  line,  the  items  in  clean_ext  are  appended to @gener-
-              ated_exts.  So these two variables have the same  meaning  (con-
+              After  initialization  of latexmk and the processing of its com-
+              mand line, the  items  in  clean_ext  are  appended  to  @gener-
+              ated_exts.   So  these two variables have the same meaning (con-
               trary to older versions of latexmk).
 
-              The  items  in @generated_exts are normally extensions of files,
-              whose base name is the same as the main tex  file.   But  it  is
-              also  possible  to  specify patterns including that basename ---
+              The items in @generated_exts are normally extensions  of  files,
+              whose  base  name  is  the same as the main tex file.  But it is
+              also possible to specify patterns including  that  basename  ---
               see the explanation of the variable $clean_ext.
 
               In addition to specifying files to be deleted in a clean up, la-
-              texmk  uses  the same specification to assist its examination of
-              changes in source files: Under some situations it needs to  find
-              those  changes in files (since a previous run) that are expected
-              to be due to the user editing a file.  This contrasts  with  the
+              texmk uses the same specification to assist its  examination  of
+              changes  in source files: Under some situations it needs to find
+              those changes in files (since a previous run) that are  expected
+              to  be  due to the user editing a file.  This contrasts with the
               cases of files that are generated by some program run by latexmk
-              and that differ from the results of the previous run.  This  use
-              of  @generated_exts is normally unimportant, given the usual ac-
-              curacy of latexmk's other ways of  determining  these  generated
+              and  that differ from the results of the previous run.  This use
+              of @generated_exts is normally unimportant, given the usual  ac-
+              curacy  of  latexmk's  other ways of determining these generated
               files.
 
-              A  convenient way to add an extra extension to the list, without
-              losing the already defined ones is to use a push command in  the
+              A convenient way to add an extra extension to the list,  without
+              losing  the already defined ones is to use a push command in the
               line in an RC file.  E.g.,
 
                               push @generated_exts, "end";
 
+              adds the extension "end" to the list of predefined generated ex-
+              tensions.   (This  extension  is used by the RevTeX package, for
+              example.)
 
 
-                               18 November 2022                             48
+       $go_mode [0]
+              If nonzero, process files regardless of timestamps, and is  then
+              equivalent to the -g option.
 
+       %hash_calc_ignore_pattern
+              !!!This variable is for experts only!!!
 
+              The  general rule latexmk uses for determining when an extra run
+              of some program is needed is that one of the  source  files  has
+              changed.   But  consider for example a latex package that causes
+              an encapsulated postscript file (an "eps" file) to be made  that
+              is  to  be read in on the next run.  The file contains a comment
+              line giving its creation date and time.  On  the  next  run  the
+              time  changes,  latex  sees  that  the eps file has changed, and
+              therefore reruns latex.  This causes an infinite loop,  that  is
+              only  terminated  because  latexmk  has a limit on the number of
+              runs to guard against pathological situations.
 
+              But the changing line has no real effect, since it is a comment.
 
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
+                                7 January 2023                              51
 
-              adds the extension "end" to the list of predefined generated ex-
-              tensions.  (This extension is used by the  RevTeX  package,  for
-              example.)
 
 
-       $go_mode [0]
-              If  nonzero, process files regardless of timestamps, and is then
-              equivalent to the -g option.
 
-       %hash_calc_ignore_pattern
-              !!!This variable is for experts only!!!
 
-              The general rule latexmk uses for determining when an extra  run
-              of  some  program  is needed is that one of the source files has
-              changed.  But consider for example a latex package  that  causes
-              an  encapsulated postscript file (an "eps" file) to be made that
-              is to be read in on the next run.  The file contains  a  comment
-              line  giving  its  creation  date and time.  On the next run the
-              time changes, latex sees that the  eps  file  has  changed,  and
-              therefore  reruns  latex.  This causes an infinite loop, that is
-              only terminated because latexmk has a limit  on  the  number  of
-              runs to guard against pathological situations.
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
-              But the changing line has no real effect, since it is a comment.
+
               You can instruct latex to ignore the offending line as follows:
 
                  $hash_calc_ignore_pattern{'eps'} = '^%%CreationDate: ';
 
               This creates a rule for files with extension .eps about lines to
-              ignore.   The left-hand side is a Perl idiom for setting an item
-              in a hash.  Note that the file extension is specified without  a
+              ignore.  The left-hand side is a Perl idiom for setting an  item
+              in  a hash.  Note that the file extension is specified without a
               period.  The value, on the right-hand side, is a string contain-
-              ing a regular expression.  (See documentation on  Perl  for  how
-              they  are  to be specified in general.)  This particular regular
-              expression specifies that lines beginning with  "%%CreationDate:
-              "  are to be ignored in deciding whether a file of the given ex-
+              ing  a  regular  expression.  (See documentation on Perl for how
+              they are to be specified in general.)  This  particular  regular
+              expression  specifies that lines beginning with "%%CreationDate:
+              " are to be ignored in deciding whether a file of the given  ex-
               tension .eps has changed.
 
-              There is only one regular expression available for  each  exten-
-              sion.   If you need more one pattern to specify lines to ignore,
-              then you need to combine the patterns into a single regular  ex-
-              pression.   The simplest method is separate the different simple
-              patterns by a vertical bar character  (indicating  "alternation"
+              There  is  only one regular expression available for each exten-
+              sion.  If you need more one pattern to specify lines to  ignore,
+              then  you need to combine the patterns into a single regular ex-
+              pression.  The simplest method is separate the different  simple
+              patterns  by  a vertical bar character (indicating "alternation"
               in the jargon of regular expressions).  For example,
 
-                 $hash_calc_ignore_pattern{'eps'}  = '^%%CreationDate: |^%%Ti-
+                 $hash_calc_ignore_pattern{'eps'} = '^%%CreationDate:  |^%%Ti-
               tle: ';
 
               causes lines starting with either "^%%CreationDate: " or "^%%Ti-
               tle: " to be ignored.
 
-              It  may happen that a pattern to be ignored is specified in, for
-              example, in a system or user initialization file, and  you  wish
-              to  remove  this  in a file that is read later.  To do this, you
+              It may happen that a pattern to be ignored is specified in,  for
+              example,  in  a system or user initialization file, and you wish
+              to remove this in a file that is read later.  To  do  this,  you
+              use Perl's delete function, e.g.,
 
+                  delete $hash_calc_ignore_pattern{'eps'};
 
 
-                               18 November 2022                             49
+       $jobname [""]
 
+              This  specifies the jobname, i.e., the basename that is used for
+              generated files (.aux, .log, .dvi, .ps,  .pdf,  etc).   If  this
+              variable  is a null string, then the basename is the basename of
+              the main tex file.  (At present, the string in  $jobname  should
+              not contain spaces.)
 
+              The  placeholder  '%A' is permitted. This will be substituted by
+              the basename of the TeX file.  The primary purpose is when a va-
+              riety  of  tex  files are to be processed, and you want to use a
+              different jobname for each but one that is  distinct  for  each.
+              Thus  if you wanted to compare compilations of a set of files on
+              different operating systems, with distinct filenames for all the
+              cases, you could set
 
+                 $jobname = "%A-$^O";
 
+              in  an initialization file.  (Here $^O is a variable provided by
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-              use Perl's delete function, e.g.,
+                                7 January 2023                              52
 
-                  delete $hash_calc_ignore_pattern{'eps'};
 
 
-       $jobname [""]
 
-              This specifies the jobname, i.e., the basename that is used  for
-              generated  files  (.aux,  .log,  .dvi, .ps, .pdf, etc).  If this
-              variable is a null string, then the basename is the basename  of
-              the  main  tex file.  (At present, the string in $jobname should
-              not contain spaces.)
 
-              The placeholder '%A' is permitted. This will be  substituted  by
-              the basename of the TeX file.  The primary purpose is when a va-
-              riety of tex files are to be processed, and you want  to  use  a
-              different  jobname  for  each but one that is distinct for each.
-              Thus if you wanted to compare compilations of a set of files  on
-              different operating systems, with distinct filenames for all the
-              cases, you could set
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
-                 $jobname = "%A-$^O";
 
-              in an initialization file.  (Here $^O is a variable provided  by
               perl that contains perl's name for the operating system.)
 
-              Suppose  you  had .tex files test1.tex and test2.tex.  Then when
+              Suppose you had .tex files test1.tex and test2.tex.   Then  when
               you run
 
                  latexmk -pdf *.tex
 
-              both files will be compiled.  The .aux,  .log,  and  .pdf  files
-              will  have  basenames  test1-MSWin32 ante test2-MSWin32 on a MS-
+              both  files  will  be  compiled.  The .aux, .log, and .pdf files
+              will have basenames test1-MSWin32 ante test2-MSWin32  on  a  MS-
               Windows system, test1-darwin and test2-darwin on an OS-X system,
               and a variety of similar cases on linux systems.
 
 
        $kpsewhich ["kpsewhich %S"]
-              The  program  called to locate a source file when the name alone
-              is not sufficient.  Most filenames used by latexmk  have  suffi-
+              The program called to locate a source file when the  name  alone
+              is  not  sufficient.  Most filenames used by latexmk have suffi-
               cient path information to be found directly.  But sometimes, no-
               tably when a .bib or a .bst file is found from the log file of a
-              bibtex  or  biber  run, only the base name of the file is known,
+              bibtex or biber run, only the base name of the  file  is  known,
               but not its path. The program specified by $kpsewhich is used to
               find it.
 
-              (For  advanced  users: Because of the different way in which la-
+              (For advanced users: Because of the different way in  which  la-
               texmk uses the command specified in $kpsewhich, some of the pos-
               sibilities listed in the FORMAT OF COMMAND SPECIFICATIONS do not
-              apply.  The internal and start keywords  are  not  available.  A
+              apply.   The  internal  and  start keywords are not available. A
               simple command specification with possible options and then "%S"
-              is all that is guaranteed to work.  Note  that  for  other  com-
+              is  all  that  is  guaranteed to work.  Note that for other com-
               mands, "%S" is substituted by a single source file. In contrast,
               for $kpsewhich, "%S" may be substituted by a long list of space-
-
-
-
-                               18 November 2022                             50
-
-
-
-
-
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
-              separated  filenames,  each  of  which is quoted.  The result on
+              separated filenames, each of which is  quoted.   The  result  on
               STDOUT of running the command is then piped to latexmk.)
 
-              See also the @BIBINPUTS variable for another  way  that  latexmk
+              See  also  the  @BIBINPUTS variable for another way that latexmk
               also uses to try to locate files; it applies only in the case of
               .bib files.
 
        $kpsewhich_show [0]
-              Whether to show diagnostics about invocations of kpsewhich:  the
-              command  line  use to invoke it and the results.  These diagnos-
-              tics are shown if $kpsewhich_show is non-zero or if  diagnostics
-              mode  is on.  (But in the second case, lots of other diagnostics
-              are also shown.)  Without these  diagnostics  there  is  nothing
-              visible  in  latexmk's  screen output about invocations of kpse-
+              Whether  to show diagnostics about invocations of kpsewhich: the
+              command line use to invoke it and the results.   These  diagnos-
+              tics  are shown if $kpsewhich_show is non-zero or if diagnostics
+              mode is on.  (But in the second case, lots of other  diagnostics
+              are  also  shown.)   Without  these diagnostics there is nothing
+              visible in latexmk's screen output about  invocations  of  kpse-
               which.
 
        $landscape_mode [0]
               If nonzero, run in landscape mode, using the landscape mode pre-
-              viewers  and dvi to postscript converters.  Equivalent to the -l
+              viewers and dvi to postscript converters.  Equivalent to the  -l
               option.  Normally not needed with current previewers.
 
        $latex ["latex %O %S"]
-              Specifies the command line for  the  LaTeX  processing  program.
-              Note  that as with other programs, you can use this variable not
-              just to change the name of the program used,  but  also  specify
-              options to the program.  E.g.,
+              Specifies  the  command  line  for the LaTeX processing program.
+              Note that as with other programs, you can use this variable  not
 
-                                  $latex = "latex --src-specials %O %S";
 
-              To  do  a  coordinated  setting  of all of $dvilualatex, $latex,
-              $pdflatex, $lualatex, and $xelatex, see  the  section  "Advanced
-              Configuration".
 
+                                7 January 2023                              53
 
-       %latex_input_extensions
-              This  variable specifies the extensions tried by latexmk when it
-              finds that a LaTeX run resulted in an error that a file has  not
-              been  found,  and  the file is given without an extension.  This
-              typically happens when LaTeX commands of the  form  \input{file}
-              or  \includegraphics{figure}, when the relevant source file does
-              not exist.
 
-              In this situation, latexmk searches for custom  dependencies  to
-              make  the  missing  file(s),  but restricts it to the extensions
-              specified by the variable %latex_input_extensions.  The  default
-              extensions are 'tex' and 'eps'.
 
-              (For  Perl experts: %latex_input_extensions is a hash whose keys
-              are the extensions.  The values are  irrelevant.)   Two  subrou-
-              tines  are  provided for manipulating this and the related vari-
-              able %pdflatex_input_extensions,  add_input_ext  and  remove_in-
-              put_ext.   They are used as in the following examples are possi-
-              ble lines in an initialization file:
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-                               18 November 2022                             51
+              just  to  change  the name of the program used, but also specify
+              options to the program.  E.g.,
 
+                                  $latex = "latex --src-specials %O %S";
 
+              To do a coordinated setting  of  all  of  $dvilualatex,  $latex,
+              $pdflatex,  $lualatex,  and  $xelatex, see the section "Advanced
+              Configuration".
 
 
+       %latex_input_extensions
+              This variable specifies the extensions tried by latexmk when  it
+              finds  that a LaTeX run resulted in an error that a file has not
+              been found, and the file is given without  an  extension.   This
+              typically  happens  when LaTeX commands of the form \input{file}
+              or \includegraphics{figure}, when the relevant source file  does
+              not exist.
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+              In  this  situation, latexmk searches for custom dependencies to
+              make the missing file(s), but restricts  it  to  the  extensions
+              specified  by the variable %latex_input_extensions.  The default
+              extensions are 'tex' and 'eps'.
 
+              (For Perl experts: %latex_input_extensions is a hash whose  keys
+              are  the  extensions.   The values are irrelevant.)  Two subrou-
+              tines are provided for manipulating this and the  related  vari-
+              able  %pdflatex_input_extensions,  add_input_ext  and remove_in-
+              put_ext.  They are used as in the following examples are  possi-
+              ble lines in an initialization file:
 
                   remove_input_ext( 'latex', 'tex' );
 
@@ -3376,19 +3538,19 @@
 
                   add_input_ext( 'latex', 'asdf' );
 
-              add the extension 'asdf to  latex_input_extensions.   (Naturally
+              add  the  extension 'asdf to latex_input_extensions.  (Naturally
               with such an extension, you should have made an appropriate cus-
               tom dependency for latexmk, and should also have done the appro-
-              priate  programming  in the LaTeX source file to enable the file
-              to be read.  The standard extensions are handled  by  LaTeX  and
+              priate programming in the LaTeX source file to enable  the  file
+              to  be  read.   The standard extensions are handled by LaTeX and
               its graphics/graphicx packages.)
 
        $latex_silent_switch ["-interaction=batchmode"]
-              Switch(es)  for the LaTeX processing program when silent mode is
+              Switch(es) for the LaTeX processing program when silent mode  is
               on.
 
-              If you use MikTeX, you may prefer the results if  you  configure
-              the  options  to include -c-style-errors, e.g., by the following
+              If  you  use MikTeX, you may prefer the results if you configure
+              the options to include -c-style-errors, e.g., by  the  following
               line in an initialization file
 
                 $latex_silent_switch  =  "-interaction=batchmode  -c-style-er-
@@ -3395,10 +3557,21 @@
               rors";
 
 
+
+
+                                7 January 2023                              54
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
        $lpr ["lpr %O %S" under UNIX/Linux, "NONE lpr" under MS-Windows]
               The command to print postscript files.
 
-              Under  MS-Windows (unlike UNIX/Linux), there is no standard pro-
+              Under MS-Windows (unlike UNIX/Linux), there is no standard  pro-
               gram for printing files.  But there are ways you can do it.  For
               example, if you have gsview installed, you could use it with the
               option "/p":
@@ -3405,12 +3578,12 @@
 
                   $lpr = '"c:/Program Files/Ghostgum/gsview/gsview32.exe" /p';
 
-              If gsview is installed in a different directory, you  will  need
-              to  make the appropriate change.  Note the combination of single
-              and double quotes around the name.  The  single  quotes  specify
-              that  this is a string to be assigned to the configuration vari-
-              able $lpr.  The double quotes are part of the string  passed  to
-              the  operating  system to get the command obeyed; this is neces-
+              If  gsview  is installed in a different directory, you will need
+              to make the appropriate change.  Note the combination of  single
+              and  double  quotes  around the name.  The single quotes specify
+              that this is a string to be assigned to the configuration  vari-
+              able  $lpr.   The double quotes are part of the string passed to
+              the operating system to get the command obeyed; this  is  neces-
               sary because one part of the command name ("Program Files") con-
               tains a space which would otherwise be misinterpreted.
 
@@ -3420,24 +3593,13 @@
        $lpr_pdf ["NONE lpr_pdf"]
               The printing program to print pdf files.
 
-              Under  MS-Windows you could set this to use gsview, if it is in-
+              Under MS-Windows you could set this to use gsview, if it is  in-
               stalled, e.g.,
 
                   $lpr = '"c:/Program Files/Ghostgum/gsview/gsview32.exe" /p';
 
-
-
-                               18 November 2022                             52
-
-
-
-
-
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
-              If gsview is installed in a different directory, you  will  need
-              to  make  the appropriate change.  Note the double quotes around
+              If  gsview  is installed in a different directory, you will need
+              to make the appropriate change.  Note the double  quotes  around
               the name: this is necessary because one part of the command name
               ("Program Files") contains a space which would otherwise be mis-
               interpreted.
@@ -3444,25 +3606,37 @@
 
        $lualatex ["lualatex %O %S"]
               Specifies the command line for the LaTeX processing program that
-              is  to be used when the lualatex program is called for (e.g., by
+              is to be used when the lualatex program is called for (e.g.,  by
               the option -lualatex.
 
-              To do a coordinated setting  of  all  of  $dvilualatex,  $latex,
-              $pdflatex,  $lualatex,  and  $xelatex, see the section "Advanced
+              To  do  a  coordinated  setting  of all of $dvilualatex, $latex,
+              $pdflatex, $lualatex, and $xelatex, see  the  section  "Advanced
               Configuration".
 
 
        %lualatex_input_extensions
-              This variable specifies the extensions tried by latexmk when  it
-              finds  that  a lualatex run resulted in an error that a file has
-              not been found, and the file  is  given  without  an  extension.
-              This  typically  happens  when  LaTeX  commands of the form \in-
-              put{file} or \includegraphics{figure}, when the relevant  source
+              This  variable specifies the extensions tried by latexmk when it
+              finds that a lualatex run resulted in an error that a  file  has
+              not  been  found,  and  the  file is given without an extension.
+              This typically happens when LaTeX  commands  of  the  form  \in-
+              put{file}  or \includegraphics{figure}, when the relevant source
               file does not exist.
 
-              In  this  situation, latexmk searches for custom dependencies to
-              make the missing file(s), but restricts  it  to  the  extensions
-              specified  by  the variable %pdflatex_input_extensions.  The de-
+
+
+
+                                7 January 2023                              55
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
+              In this situation, latexmk searches for custom  dependencies  to
+              make  the  missing  file(s),  but restricts it to the extensions
+              specified by the variable %pdflatex_input_extensions.   The  de-
               fault extensions are 'tex', 'pdf', 'jpg, and 'png'.
 
               See details of the %latex_input_extensions for other information
@@ -3469,10 +3643,10 @@
               that equally applies to %lualatex_input_extensions.
 
        $lualatex_silent_switch ["-interaction=batchmode"]
-              Switch(es)  for  the lualatex program (specified in the variable
+              Switch(es) for the lualatex program (specified in  the  variable
               $lualatex) when silent mode is on.
 
-              See details of the $latex_silent_switch  for  other  information
+              See  details  of  the $latex_silent_switch for other information
               that equally applies to $lualatex_silent_switch.
 
        $make ["make"]
@@ -3482,133 +3656,117 @@
               The index processing program.
 
        $makeindex_fudge [0]
-              When  using  makeindex,  whether to change directory to $aux_dir
-              before running makeindex.  Set to 1 if $aux_dir is  not  an  ex-
-              plicit  subdirectory  of  current directory, otherwise makeindex
+              When using makeindex, whether to change  directory  to  $aux_dir
+              before  running  makeindex.   Set to 1 if $aux_dir is not an ex-
+              plicit subdirectory of current  directory,  otherwise  makeindex
               will refuse to write its output and log files, for security rea-
               sons.
 
        $makeindex_silent_switch ["-q"]
-              Switch(es)  for the index processing program when silent mode is
+              Switch(es) for the index processing program when silent mode  is
+              on.
 
+       $max_repeat [5]
+              The  maximum  number of times latexmk will run *latex before de-
+              ciding that there may be an infinite loop and that it  needs  to
+              bail  out,  rather than rerunning *latex again to resolve cross-
+              references, etc.  The default value covers all normal cases.
 
+              (Note that the "etc" covers a lot of cases where one run of *la-
+              tex generates files to be read in on a later run.)
 
-                               18 November 2022                             53
+       $MSWin_back_slash [1]
+              This  configuration  variable only has an effect when latexmk is
+              running under MS-Windows.  With the default value of 1 for  this
+              variable,  when  a command is executed under MS-Windows, latexmk
+              substitutes "\" for the separator character  between  components
+              of  a  directory name.  Internally, latexmk uses "/" for the di-
+              rectory separator character, which  is  the  character  used  by
+              Unix-like systems.
 
+              For  almost  all programs and for almost all filenames under MS-
+              Windows, both "\" and "/" are acceptable as the directory  sepa-
+              rator  character,  provided at least that filenames are properly
+              quoted.  But it is possible that programs exist that only accept
 
 
 
+                                7 January 2023                              56
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-              on.
 
-       $max_repeat [5]
-              The maximum number of times latexmk will run *latex  before  de-
-              ciding  that  there may be an infinite loop and that it needs to
-              bail out, rather than rerunning *latex again to  resolve  cross-
-              references, etc.  The default value covers all normal cases.
 
-              (Note that the "etc" covers a lot of cases where one run of *la-
-              tex generates files to be read in on a later run.)
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
-       $MSWin_back_slash [1]
-              This configuration variable only has an effect when  latexmk  is
-              running  under MS-Windows.  With the default value of 1 for this
-              variable, when a command is executed under  MS-Windows,  latexmk
-              substitutes  "\"  for the separator character between components
-              of a directory name.  Internally, latexmk uses "/" for  the  di-
-              rectory  separator  character,  which  is  the character used by
-              Unix-like systems.
 
-              For almost all programs and for almost all filenames  under  MS-
-              Windows,  both "\" and "/" are acceptable as the directory sepa-
-              rator character, provided at least that filenames  are  properly
-              quoted.  But it is possible that programs exist that only accept
-              "\" on the command line, since that is  the  standard  directory
-              separator  for MS-Windows.  So for safety latexmk makes the sub-
+              "\"  on  the  command line, since that is the standard directory
+              separator for MS-Windows.  So for safety latexmk makes the  sub-
               stitution from "/" to "\", by default.
 
-              However there are also programs on MS-Windows for which  a  back
+              However  there  are also programs on MS-Windows for which a back
               slash "\" is interpreted differently than as a directory separa-
-              tor; for these the directory separator should be "/".   Programs
-              with  this  behavior  include  all  the  *latex  programs in the
-              TeXLive implementation  (but  not  the  MiKTeX  implementation).
-              Hence  if  you use TeXLive on MS-Windows, then $MSWin_back_slash
+              tor;  for these the directory separator should be "/".  Programs
+              with this behavior  include  all  the  *latex  programs  in  the
+              TeXLive  implementation  (but  not  the  MiKTeX implementation).
+              Hence if you use TeXLive on MS-Windows,  then  $MSWin_back_slash
               should be set to zero.
 
 
        $new_viewer_always [0]
-              This variable applies  to  latexmk  only  in  continuous-preview
+              This  variable  applies  to  latexmk  only in continuous-preview
               mode.  If $new_viewer_always is 0, latexmk will check for a pre-
-              viously running previewer on the same file, and if one  is  run-
-              ning  will  not  start a new one.  If $new_viewer_always is non-
-              zero, this check will be skipped, and latexmk will behave as  if
+              viously  running  previewer on the same file, and if one is run-
+              ning will not start a new one.  If  $new_viewer_always  is  non-
+              zero,  this check will be skipped, and latexmk will behave as if
               no viewer is running.
 
        $out_dir [""]
-              If  non-blank,  this  variable  specifies the directory in which
-              output files are to be written by a run of *latex.  See also the
-              variable $aux_dir.
+              If non-blank, this variable specifies the output directory.
 
-              The  effect of this variable (when non-blank) is achieved by us-
-              ing the -output-directory option of *latex.  This exists in  the
-              usual  current  (Dec.  2011  and  later) implementations of TeX,
-              i.e., MiKTeX and TeXLive. But it may not  be  present  in  other
+              This is the directory in which final output  files  are  written
+              (dvi,  ps,  pdf,  synctex, synctex.gz).  In addition, if the aux
+              directory equals the output directory, as is  the  case  by  de-
+              fault,  then  other generated files are in effect written to the
+              output directory.
 
+              If $out_dir is blank, the output directory is the current direc-
+              tory  at the invocation of *latex; this is equivalent to setting
+              $out_dir to '.'.
 
+              See the section AUXILIARY AND OUTPUT DIRECTORIES  for  more  de-
+              tails.
 
-                               18 November 2022                             54
 
 
+       $pdf_mode [0]
+              If  zero,  do  NOT  generate  a pdf version of the document.  If
+              equal to 1, generate a pdf version of the document using  pdfla-
+              tex,  using the command specified by the $pdflatex variable.  If
+              equal to 2, generate a pdf version of the document from  the  ps
+              file,  by  using  the command specified by the $ps2pdf variable.
+              If equal to 3, generate a pdf version of the document  from  the
+              dvi  file,  by  using the command specified by the $dvipdf vari-
+              able.  If equal to 4, generate a pdf version of the document us-
+              ing lualatex, using the command specified by the $lualatex vari-
+              able.  If equal to 5, generate a pdf version (and  an  xdv  ver-
+              sion)  of  the document using xelatex, using the commands speci-
+              fied by the $xelatex and xdvipdfmx variables.
 
+              In $pdf_mode=2, it is ensured that .dvi and .ps files  are  also
 
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
+                                7 January 2023                              57
 
-              versions.
 
-              If  you also use the -cd option, and $out_dir (or $aux_dir) con-
-              tains a relative path, then the path is interpreted relative  to
-              the document directory.
 
-              Commonly,  the  directory specified for output files is a subdi-
-              rectory of the current working directory.  However, if you spec-
-              ify  some  other  directory, e.g., "/tmp/foo" or "../output", be
-              aware that this could cause problems, e.g.,  with  makeindex  or
-              bibtex.   This  is because modern versions of these programs, by
-              default, will refuse to work when they find that they are  asked
-              to  write  to  a  file in a directory that appears not to be the
-              current working directory or one of its subdirectories.  This is
-              part  of  security  measures by the whole TeX system that try to
-              prevent malicious or errant TeX documents from incorrectly mess-
-              ing with a user's files.  If for $out_dir or $aux_dir you really
-              do need to specify an absolute pathname (e.g., "/tmp/foo") or  a
-              path (e.g., "../output") that includes a higher-level directory,
-              and you need to use makeindex or bibtex, then you need  to  dis-
-              able  the  security measures (and assume any risks).  One way of
-              doing this is to temporarily set an operating system environment
-              variable  openout_any  to "a" (as in "all"), to override the de-
-              fault "paranoid" setting.
 
-       $pdf_mode [0]
-              If zero, do NOT generate a pdf  version  of  the  document.   If
-              equal  to 1, generate a pdf version of the document using pdfla-
-              tex, using the command specified by the $pdflatex variable.   If
-              equal  to  2, generate a pdf version of the document from the ps
-              file, by using the command specified by  the  $ps2pdf  variable.
-              If  equal  to 3, generate a pdf version of the document from the
-              dvi file, by using the command specified by  the  $dvipdf  vari-
-              able.  If equal to 4, generate a pdf version of the document us-
-              ing lualatex, using the command specified by the $lualatex vari-
-              able.   If  equal  to 5, generate a pdf version (and an xdv ver-
-              sion) of the document using xelatex, using the  commands  speci-
-              fied by the $xelatex and xdvipdfmx variables.
 
-              In  $pdf_mode=2,  it is ensured that .dvi and .ps files are also
-              made.  In $pdf_mode=3, it is ensured that a .dvi  file  is  also
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
+              made.   In  $pdf_mode=3,  it is ensured that a .dvi file is also
               made.  But this may be overridden by the document.
 
        $pdflatex ["pdflatex %O %S"]
@@ -3620,40 +3778,28 @@
 
                    $pdflatex = "pdflatex --shell-escape %O %S";
 
-              (In  some  earlier versions of latexmk, you needed to use an as-
-              signment to $pdflatex to allow the use of  lualatex  or  xelatex
-
-
-
-                               18 November 2022                             55
-
-
-
-
-
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
+              (In some earlier versions of latexmk, you needed to use  an  as-
+              signment  to  $pdflatex  to allow the use of lualatex or xelatex
               instead of pdflatex.  There are now separate configuration vari-
-              ables for the use of lualatex or  xelatex.   See  $lualatex  and
+              ables  for  the  use  of lualatex or xelatex.  See $lualatex and
               $xelatex.)
 
-              To  do  a  coordinated  setting  of all of $dvilualatex, $latex,
-              $pdflatex, $lualatex, and $xelatex, see  the  section  "Advanced
+              To do a coordinated setting  of  all  of  $dvilualatex,  $latex,
+              $pdflatex,  $lualatex,  and  $xelatex, see the section "Advanced
               Configuration".
 
 
        %pdflatex_input_extensions
-              This  variable specifies the extensions tried by latexmk when it
-              finds that a pdflatex run resulted in an error that a  file  has
-              not  been  found,  and  the  file is given without an extension.
-              This typically happens when LaTeX  commands  of  the  form  \in-
-              put{file}  or \includegraphics{figure}, when the relevant source
+              This variable specifies the extensions tried by latexmk when  it
+              finds  that  a pdflatex run resulted in an error that a file has
+              not been found, and the file  is  given  without  an  extension.
+              This  typically  happens  when  LaTeX  commands of the form \in-
+              put{file} or \includegraphics{figure}, when the relevant  source
               file does not exist.
 
-              In this situation, latexmk searches for custom  dependencies  to
-              make  the  missing  file(s),  but restricts it to the extensions
-              specified by the variable %pdflatex_input_extensions.   The  de-
+              In  this  situation, latexmk searches for custom dependencies to
+              make the missing file(s), but restricts  it  to  the  extensions
+              specified  by  the variable %pdflatex_input_extensions.  The de-
               fault extensions are 'tex', 'pdf', 'jpg, and 'png'.
 
               See details of the %latex_input_extensions for other information
@@ -3660,67 +3806,66 @@
               that equally applies to %pdflatex_input_extensions.
 
        $pdflatex_silent_switch ["-interaction=batchmode"]
-              Switch(es) for the pdflatex program (specified in  the  variable
+              Switch(es)  for  the pdflatex program (specified in the variable
               $pdflatex) when silent mode is on.
 
-              See  details  of  the $latex_silent_switch for other information
+              See details of the $latex_silent_switch  for  other  information
               that equally applies to $pdflatex_silent_switch.
 
        $pdf_previewer ["start acroread %O %S"]
               The command to invoke a pdf-previewer.
 
-              On MS-Windows, the default is changed to "cmd /c start """;  un-
-              der  more  recent versions of Windows, this will cause to be run
+              On  MS-Windows, the default is changed to "cmd /c start """; un-
+              der more recent versions of Windows, this will cause to  be  run
               whatever command the system has associated with .pdf files.  But
-              this  may  be  undesirable if this association is to acroread --
+              this may be undesirable if this association is  to  acroread  --
               see the notes in the explanation of the -pvc option.]
 
-              On OS-X the default is changed to "open %S",  which  results  in
-              OS-X  starting up (and detaching) the viewer associated with the
-              file.  By default, for pdf files this association is  to  OS-X's
-              preview, which is quite satisfactory.
 
-              WARNING:   Problem  under MS-Windows: if acroread is used as the
-              pdf previewer, and it is actually viewing a pdf  file,  the  pdf
-              file  cannot  be  updated.   Thus makes acroread a bad choice of
-              previewer if you use latexmk's previous-continuous mode  (option
-              -pvc) under MS-windows.  This problem does not occur if, for ex-
-              ample, SumatraPDF or gsview is used to view pdf files.
 
-              Important note: Normally you will want to have a  previewer  run
+                                7 January 2023                              58
 
 
 
-                               18 November 2022                             56
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+              On  OS-X  the  default is changed to "open %S", which results in
+              OS-X starting up (and detaching) the viewer associated with  the
+              file.   By  default, for pdf files this association is to OS-X's
+              preview, which is quite satisfactory.
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+              WARNING:  Problem under MS-Windows: if acroread is used  as  the
+              pdf  previewer,  and  it is actually viewing a pdf file, the pdf
+              file cannot be updated.  Thus makes acroread  a  bad  choice  of
+              previewer  if you use latexmk's previous-continuous mode (option
+              -pvc) under MS-windows.  This problem does not occur if, for ex-
+              ample, SumatraPDF or gsview is used to view pdf files.
 
-
+              Important  note:  Normally you will want to have a previewer run
               detached, so that latexmk doesn't wait for the previewer to ter-
-              minate before continuing its work.  So normally you should  pre-
-              fix  the  command  by  "start  ", which flags to latexmk that it
-              should do the detaching of the  previewer  itself  (by  whatever
-              method  is  appropriate to the operating system).  But sometimes
+              minate  before continuing its work.  So normally you should pre-
+              fix the command by "start ", which  flags  to  latexmk  that  it
+              should  do  the  detaching  of the previewer itself (by whatever
+              method is appropriate to the operating system).   But  sometimes
               letting latexmk do the detaching is not appropriate (for a vari-
-              ety  of non-trivial reasons), so you should put the "start " bit
+              ety of non-trivial reasons), so you should put the "start "  bit
               in yourself, whenever it is needed.
 
        $pdf_update_command [""]
-              When the pdf previewer is set to be updated by  running  a  com-
-              mand,  this is the command that is run.  See the information for
+              When  the  pdf  previewer is set to be updated by running a com-
+              mand, this is the command that is run.  See the information  for
               the variable $pdf_update_method.
 
        $pdf_update_method [1 under UNIX, 3 under MS-Windows]
-              How the pdf viewer updates its display when  the  pdf  file  has
-              changed.  See the information on the variable $dvi_update_method
+              How  the  pdf  viewer  updates its display when the pdf file has
+              changed. See the information on the variable  $dvi_update_method
               for the codes.  (Note that information needs be changed slightly
-              so  that for the value 4, to run a command to do the update, the
-              command is specified by the  variable  $pdf_update_command,  and
-              for  the  value  2,  to  specify update by signal, the signal is
+              so that for the value 4, to run a command to do the update,  the
+              command  is  specified  by the variable $pdf_update_command, and
+              for the value 2, to specify update  by  signal,  the  signal  is
               specified by $pdf_update_signal.)
 
               Note that acroread under MS-Windows (but not UNIX) locks the pdf
@@ -3733,52 +3878,52 @@
                   $pdf_update_method = 4;
                   $pdf_update_command = "xpdf -remote %R -reload";
 
-              The first setting arranges for the xpdf program to  be  used  in
-              its  "remote server mode", with the server name specified as the
-              rootname of the TeX file.  The second setting arranges  for  up-
-              dating  to  be done in response to a command, and the third set-
+              The  first  setting  arranges for the xpdf program to be used in
+              its "remote server mode", with the server name specified as  the
+              rootname  of  the TeX file.  The second setting arranges for up-
+              dating to be done in response to a command, and the  third  set-
               ting sets the update command.
 
-       $pdf_update_signal [Under UNIX: SIGHUP,  which  is  a  system-dependent
+       $pdf_update_signal  [Under  UNIX:  SIGHUP,  which is a system-dependent
        value]
-              The  number of the signal that is sent to the pdf viewer when it
-              is updated by sending a signal -- see  the  information  on  the
-              variable  $pdf_update_method.   The default value is the one ap-
-              propriate for gv on a UNIX system.
 
-       $pid_position[1 under UNIX, -1 under MS-Windows]
-              The variable $pid_position is used  to  specify  which  word  in
-              lines  of  the output from $pscmd corresponds to the process ID.
-              The first word in the line is numbered 0.  The default value  of
-              1 (2nd word in line) is correct for Solaris 2.6, Linux, and OS-X
-              with their default settings of $pscmd.
 
-              Setting the variable to -1 is used to indicate  that  $pscmd  is
 
+                                7 January 2023                              59
 
 
-                               18 November 2022                             57
 
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+              The number of the signal that is sent to the pdf viewer when  it
+              is  updated  by  sending  a signal -- see the information on the
+              variable $pdf_update_method.  The default value is the  one  ap-
+              propriate for gv on a UNIX system.
 
+       $pid_position[1 under UNIX, -1 under MS-Windows]
+              The  variable  $pid_position  is  used  to specify which word in
+              lines of the output from $pscmd corresponds to the  process  ID.
+              The  first word in the line is numbered 0.  The default value of
+              1 (2nd word in line) is correct for Solaris 2.6, Linux, and OS-X
+              with their default settings of $pscmd.
 
+              Setting  the  variable  to -1 is used to indicate that $pscmd is
               not to be used.
 
        $postscript_mode [0]
-              If  nonzero,  generate  a  postscript  version  of the document.
+              If nonzero, generate  a  postscript  version  of  the  document.
               Equivalent to the -ps option.
 
-              If some other request is made for which  a  postscript  file  is
+              If  some  other  request  is made for which a postscript file is
               needed, then $postscript_mode will be set to 1.
 
        $pre_tex_code ['']
 
-              Sets  TeX  code to be executed before inputting the source file.
-              This works if the relevant one of $latex, etc contains  a  suit-
+              Sets TeX code to be executed before inputting the  source  file.
+              This  works  if the relevant one of $latex, etc contains a suit-
               able command line with a %P or %U substitution.  For example you
               could do
 
@@ -3785,7 +3930,7 @@
                    $latex = 'latex %O %P';
                    $pre_tex_code = '\AtBeginDocument{An initial message\par}';
 
-              To set all of $latex, $pdflatex,  $lualatex,  and  $xelatex  you
+              To  set  all  of  $latex, $pdflatex, $lualatex, and $xelatex you
               could use the subroutine alt_tex_cmds:
 
                    &alt_tex_cmds;
@@ -3794,53 +3939,53 @@
 
 
        $preview_continuous_mode [0]
-              If  nonzero,  run a previewer to view the document, and continue
+              If nonzero, run a previewer to view the document,  and  continue
               running latexmk to keep .dvi up-to-date.  Equivalent to the -pvc
-              option.   Which  previewer is run depends on the other settings,
+              option.  Which previewer is run depends on the  other  settings,
               see the command line options -view=, and the variable $view.
 
        $preview_mode [0]
               If nonzero, run a previewer to preview the document.  Equivalent
-              to  the -pv option.  Which previewer is run depends on the other
-              settings, see the command line options -view=, and the  variable
+              to the -pv option.  Which previewer is run depends on the  other
+              settings,  see the command line options -view=, and the variable
               $view.
 
        $printout_mode [0]
-              If  nonzero,  print  the document using the command specified in
-              the $lpr variable.  Equivalent to the -p option.  This is recom-
-              mended  not to be set from an RC file, otherwise you could waste
-              lots of paper.
+              If nonzero, print the document using the  command  specified  in
 
-       $print_type = ["auto"]
-              Type of file  to  printout:  possibilities  are  "auto",  "dvi",
-              "none", "pdf", or "ps".   See the option -print= for the meaning
-              of the "auto" value.
 
-       $pscmd Command used to get all the processes currently run by the user.
-              The  -pvc  option  uses  the  command  specified by the variable
-              $pscmd to determine if there is an  already  running  previewer,
-              and  to  find  the process ID (needed if latexmk needs to signal
 
+                                7 January 2023                              60
 
 
-                               18 November 2022                             58
 
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+              the $lpr variable.  Equivalent to the -p option.  This is recom-
+              mended not to be set from an RC file, otherwise you could  waste
+              lots of paper.
 
+       $print_type = ["auto"]
+              Type  of  file  to  printout:  possibilities  are "auto", "dvi",
+              "none", "pdf", or "ps".   See the option -print= for the meaning
+              of the "auto" value.
 
+       $pscmd Command used to get all the processes currently run by the user.
+              The -pvc option uses  the  command  specified  by  the  variable
+              $pscmd  to  determine  if there is an already running previewer,
+              and to find the process ID (needed if latexmk  needs  to  signal
               the previewer about file changes).
 
               Each line of the output of this command is assumed to correspond
-              to  one  process.   See  the  $pid_position variable for how the
+              to one process.  See the  $pid_position  variable  for  how  the
               process number is determined.
 
-              The default for pscmd is  "NONE"  under  MS-Windows  and  cygwin
-              (i.e.,  the  command  is not used), "ps -ww -u $ENV{USER}" under
-              OS-X, and "ps -f -u $ENV{USER}" under  other  operating  systems
+              The  default  for  pscmd  is  "NONE" under MS-Windows and cygwin
+              (i.e., the command is not used), "ps -ww  -u  $ENV{USER}"  under
+              OS-X,  and  "ps  -f -u $ENV{USER}" under other operating systems
               (including Linux).  In these specifications "$ENV{USER}" is sub-
               stituted by the username.
 
@@ -3849,74 +3994,75 @@
 
        $ps_filter [empty]
               The postscript file filter to be run on the newly produced post-
-              script  file  before other processing.  Equivalent to specifying
+              script file before other processing.  Equivalent  to  specifying
               the -pF option.
 
        $ps_previewer ["start gv %O %S", but start %O %S under MS-Windows]
-              The command to invoke a ps-previewer.  (The  default  under  MS-
+              The  command  to  invoke a ps-previewer.  (The default under MS-
               Windows will cause to be run whatever command the system has as-
               sociated with .ps files.)
 
-              Note that gv could be used with the -watch  option  updates  its
-              display  whenever the postscript file changes, whereas ghostview
-              does not.  However, different versions of gv have slightly  dif-
-              ferent  ways  of  writing  this  option.  You can configure this
+              Note  that  gv  could be used with the -watch option updates its
+              display whenever the postscript file changes, whereas  ghostview
+              does  not.  However, different versions of gv have slightly dif-
+              ferent ways of writing this  option.   You  can  configure  this
               variable appropriately.
 
               WARNING: Linux systems may have installed one (or more) versions
-              of  gv  under  different  names, e.g., ggv, kghostview, etc, but
+              of gv under different names, e.g.,  ggv,  kghostview,  etc,  but
               perhaps not one actually called gv.
 
-              Important note: Normally you will want to have a  previewer  run
+              Important  note:  Normally you will want to have a previewer run
               detached, so that latexmk doesn't wait for the previewer to ter-
-              minate before continuing its work.  So normally you should  pre-
-              fix  the  command  by  "start  ", which flags to latexmk that it
-              should do the detaching of the  previewer  itself  (by  whatever
-              method  is  appropriate to the operating system).  But sometimes
-              letting latexmk do the detaching is not appropriate (for a vari-
-              ety  of non-trivial reasons), so you should put the "start " bit
-              in yourself, whenever it is needed.
+              minate  before continuing its work.  So normally you should pre-
+              fix the command by "start ", which  flags  to  latexmk  that  it
+              should  do  the  detaching  of the previewer itself (by whatever
+              method is appropriate to the operating system).   But  sometimes
 
 
-       $ps_previewer_landscape ["start gv -swap %O %S", but start %O %S  under
-       MS-Windows]
-              The command to invoke a ps-previewer in landscape mode.
 
-       $ps_update_command [""]
-              When  the postscript previewer is set to be updated by running a
-              command, this is the command that is run.  See  the  information
-              for the variable $ps_update_method.
+                                7 January 2023                              61
 
 
 
-                               18 November 2022                             59
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+              letting latexmk do the detaching is not appropriate (for a vari-
+              ety of non-trivial reasons), so you should put the "start "  bit
+              in yourself, whenever it is needed.
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
+       $ps_previewer_landscape  ["start gv -swap %O %S", but start %O %S under
+       MS-Windows]
+              The command to invoke a ps-previewer in landscape mode.
 
+       $ps_update_command [""]
+              When the postscript previewer is set to be updated by running  a
+              command,  this  is the command that is run.  See the information
+              for the variable $ps_update_method.
+
        $ps_update_method [0 under UNIX, 1 under MS-Windows]
-              How  the postscript viewer updates its display when the .ps file
-              has changed.  See  the  information  on  the  variable  $dvi_up-
-              date_method  for  the  codes.   (Note  that information needs be
+              How the postscript viewer updates its display when the .ps  file
+              has  changed.  See  the  information  on  the  variable $dvi_up-
+              date_method for the codes.   (Note  that  information  needs  be
               changed slightly so that for the value 4, to run a command to do
-              the  update,  the  command  is specified by the variable $ps_up-
-              date_command, and for the value 2, to specify update by  signal,
+              the update, the command is specified  by  the  variable  $ps_up-
+              date_command,  and for the value 2, to specify update by signal,
               the signal is specified by $ps_update_signal.)
 
-       $ps_update_signal  [Under  UNIX:  SIGHUP,  which  is a system-dependent
+       $ps_update_signal [Under UNIX:  SIGHUP,  which  is  a  system-dependent
        value]
-              The number of the signal that is sent to the pdf viewer when  it
-              is  updated  by  sending a signal -- see $ps_update_method.  The
+              The  number of the signal that is sent to the pdf viewer when it
+              is updated by sending a signal --  see  $ps_update_method.   The
               default value is the one appropriate for gv on a UNIX system.
 
        $pvc_timeout [0]
-              If this variable is nonzero, there will be  a   timeout  in  pvc
-              mode  after  a  period of inactivity.  Inactivity means a period
-              when latexmk has detected no file  changes  and  hence  has  not
+              If  this  variable  is  nonzero, there will be a  timeout in pvc
+              mode after a period of inactivity.  Inactivity  means  a  period
+              when  latexmk  has  detected  no  file changes and hence has not
               taken any actions like compiling the document. The period of in-
               activity is in the variable $pvc_timeout_mins.
 
@@ -3932,127 +4078,138 @@
        $quote_filenames [1]
               This specifies whether substitutions for placeholders in command
               specifications  (as  in  $pdflatex)  are  surrounded  by  double
-              quotes.  If this variable is 1 (or any other value Perl  regards
+              quotes.   If this variable is 1 (or any other value Perl regards
               as true), then quoting is done.  Otherwise quoting is omitted.
 
-              The  quoting  method used by latexmk is tested to work correctly
-              under UNIX systems (including Linux and Mac OS-X) and under  MS-
-              Windows.   It  allows  the  use  of filenames containing special
-              characters, notably spaces.  (But note  that  many  versions  of
-              *latex  cannot correctly deal with TeX files whose names contain
-              spaces.  Latexmk's quoting only ensures that such filenames  are
-              correctly  treated  by the operating system in passing arguments
-              to programs.)
+              The quoting method used by latexmk is tested to  work  correctly
+              under  UNIX systems (including Linux and Mac OS-X) and under MS-
+              Windows.  It allows the  use  of  filenames  containing  special
 
-       $rc_report [1]
-              After initialization, whether to give a list  of  the  RC  files
-              read.
 
-       $recorder [1]
-              Whether  to use the -recorder option to *latex.  Use of this op-
-              tion results in a file of extension .fls containing  a  list  of
-              the  files  that  these programs have read and written.  Latexmk
 
+                                7 January 2023                              62
 
 
-                               18 November 2022                             60
 
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+              characters,  notably  spaces.   (But  note that many versions of
+              *latex cannot correctly deal with TeX files whose names  contain
+              spaces.   Latexmk's quoting only ensures that such filenames are
+              correctly treated by the operating system in  passing  arguments
+              to programs.)
 
+       $rc_report [1]
+              After  initialization,  whether  to  give a list of the RC files
+              read.
 
+       $recorder [1]
+              Whether to use the -recorder option to *latex.  Use of this  op-
+              tion  results  in  a file of extension .fls containing a list of
+              the files that these programs have read  and  written.   Latexmk
               will then use this file to improve its detection of source files
               and generated files after a run of *latex.
 
-              It  is generally recommended to use this option (or to configure
-              the $recorder variable to be on.)  But it only works  if  *latex
-              supports  the  -recorder  option, which is true for most current
+              It is generally recommended to use this option (or to  configure
+              the  $recorder  variable to be on.)  But it only works if *latex
+              supports the -recorder option, which is true  for  most  current
               implementations
 
-              Note about the name of the .fls file:  Most  implementations  of
-              *latex  produce  an .fls file with the same basename as the main
+              Note  about  the  name of the .fls file: Most implementations of
+              *latex produce an .fls file with the same basename as  the  main
               document's LaTeX, e.g., for Document.tex, the .fls file is Docu-
-              ment.fls.   However,  some implementations instead produce files
+              ment.fls.  However, some implementations instead  produce  files
               named for the program, i.e., latex.fls or pdflatex.fls.  In this
-              second  case,  latexmk copies the latex.fls or pdflatex.fls to a
-              file with the basename of the main LaTeX document,  e.g.,  Docu-
+              second case, latexmk copies the latex.fls or pdflatex.fls  to  a
+              file  with  the basename of the main LaTeX document, e.g., Docu-
               ment.fls.
 
        $search_path_separator [See below for default]
               The character separating paths in the environment variables TEX-
-              INPUTS, BIBINPUTS, and BSTINPUTS.  This variable is mainly  used
-              by  latexmk when the -outdir, -output-directory, -auxdir, and/or
-              -aux-directory options are used.  In that case latexmk needs  to
+              INPUTS,  BIBINPUTS, and BSTINPUTS.  This variable is mainly used
+              by latexmk when the -outdir, -output-directory, -auxdir,  and/or
+              -aux-directory  options are used.  In that case latexmk needs to
               communicate  appropriately  modified  search  paths  to  bibtex,
               dvipdf, dvips, and *latex.
 
-              [Comment to technically savvy readers: *latex  doesn't  actually
-              need  the  modified  search path.  But, surprisingly, dvipdf and
-              dvips do, because sometimes graphics files get generated in  the
+              [Comment  to  technically savvy readers: *latex doesn't actually
+              need the modified search path.  But,  surprisingly,  dvipdf  and
+              dvips  do, because sometimes graphics files get generated in the
               output or aux directories.]
 
-              The  default  under  MSWin and Cygwin is ';' and under UNIX-like
-              operating systems (including Linux and OS-X) is  ':'.   Normally
-              the  defaults give correct behavior.  But there can be difficul-
-              ties if your operating system is of one kind, but some  of  your
-              software  is running under an emulator for the other kind of op-
-              erating system; in that case you'll need to  find  out  what  is
-              needed,  and  set  $search_path_separator explicitly.  (The same
-              goes, of course, for unusual operating systems that are  not  in
+              The default under MSWin and Cygwin is ';'  and  under  UNIX-like
+              operating  systems  (including Linux and OS-X) is ':'.  Normally
+              the defaults give correct behavior.  But there can be  difficul-
+              ties  if  your operating system is of one kind, but some of your
+              software is running under an emulator for the other kind of  op-
+              erating  system;  in  that  case you'll need to find out what is
+              needed, and set $search_path_separator  explicitly.   (The  same
+              goes,  of  course, for unusual operating systems that are not in
               the MSWin, Linux, OS-X, Unix collection.)
 
-       $show_time [0]
-              Whether to show CPU time used.
 
-       $silence_logfile_warnings [0]
-              Whether  after  a run of *latex to summarize warnings in the log
-              file about undefined citations  and  references.   Setting  $si-
-              lence_logfile_warnings=0 gives the summary of warnings (provided
-              silent mode isn't also set), and this is useful to locate  unde-
-              fined  citations  and  references  without searching through the
-              much more verbose log file or the screen output of *latex.   But
-              the  summary  can  also be excessively annoying.  The default is
-              not to give these  warnings.   The  command  line  options  -si-
-              lence_logfile_warning_list   and  -silence_logfile_warning_list-
-              also set this variable.
 
 
+                                7 January 2023                              63
 
-                               18 November 2022                             61
 
 
 
 
-
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-              Note that multiple occurrences for the same undefined object  on
+       $show_time [0]
+              Whether to show time used, both the  total  and  for  individual
+              steps.
+
+              Note: On MS Windows, this is clock time.  On other OSs it is the
+              CPU time used (by latexmk and the child processes  it  invokes).
+              The OS-dependence is because of a limitation of Windows.  If you
+              wish to force the use of clock instead of CPU time, you can set
+
+                  $times_are_clock = 1;
+
+
+
+       $silence_logfile_warnings [0]
+              Whether after a run of *latex to summarize warnings in  the  log
+              file  about  undefined  citations  and references.  Setting $si-
+              lence_logfile_warnings=0 gives the summary of warnings (provided
+              silent  mode isn't also set), and this is useful to locate unde-
+              fined citations and references  without  searching  through  the
+              much  more verbose log file or the screen output of *latex.  But
+              the summary can also be excessively annoying.   The  default  is
+              not  to  give  these  warnings.   The  command line options -si-
+              lence_logfile_warning_list  and   -silence_logfile_warning_list-
+              also set this variable.
+
+              Note  that multiple occurrences for the same undefined object on
               the same page and same line will be compressed to a single warn-
               ing.
 
        $silent [0]
-              Whether to run silently.  Setting $silent to 1 has the same  ef-
+              Whether  to run silently.  Setting $silent to 1 has the same ef-
               fect as the -quiet of -silent options on the command line.
 
        $sleep_time [2]
-              The  time to sleep (in seconds) between checking for source file
+              The time to sleep (in seconds) between checking for source  file
               changes when running with the -pvc option.  This is subject to a
-              minimum  of one second delay, except that zero delay is also al-
+              minimum of one second delay, except that zero delay is also  al-
               lowed.
 
-              A value of exactly 0 gives no delay, and  typically  results  in
+              A  value  of  exactly 0 gives no delay, and typically results in
               100% CPU usage, which may not be desirable.
 
        $texfile_search [""]
-              This  is  an  obsolete  variable, replaced by the @default_files
+              This is an obsolete variable,  replaced  by  the  @default_files
               variable.
 
-              For  backward  compatibility,  if  you  choose  to   set   $tex-
-              file_search,  it  is  a string of space-separated filenames, and
+              For   backward   compatibility,  if  you  choose  to  set  $tex-
+              file_search, it is a string of  space-separated  filenames,  and
               then latexmk replaces @default_files with the filenames in $tex-
               file_search to which is added "*.tex".
 
@@ -4059,112 +4216,113 @@
        $success_cmd [undefined]
               See the documentation for $compiling_cmd.
 
-       $tmpdir [See below for default]
-              Directory  to  store  temporary  files that latexmk may generate
-              while running.
 
-              The default under MSWindows (including cygwin), is to  set  $tm-
-              pdir  to the value of the first of whichever of the system envi-
-              ronment variables TMPDIR or TEMP exists, otherwise to  the  cur-
-              rent  directory.   Under other operating systems (expected to be
-              UNIX/Linux, including OS-X), the default is  the  value  of  the
-              system  environment  variable  TMPDIR  if  it  exists, otherwise
-              "/tmp".
 
-       $use_make_for_missing_files [0]
-              Whether to use make to try and make files that are missing after
-              a  run of *latex, and for which a custom dependency has not been
-              found.  This is generally useful only when latexmk  is  used  as
-              part  of  a bigger project which is built by using the make pro-
-              gram.
 
-              Note that once a missing file has been made, no further calls to
-              make  will  be made on a subsequent run of latexmk to update the
-              file.  Handling this problem is the job of  a  suitably  defined
-              Makefile.   See the section "USING latexmk WITH make" for how to
-              do this.  The intent of calling make from latexmk is  merely  to
-              detect dependencies.
+                                7 January 2023                              64
 
 
 
-                               18 November 2022                             62
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+       $tmpdir [See below for default]
+              Directory to store temporary files  that  latexmk  may  generate
+              while running.
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+              The  default  under MSWindows (including cygwin), is to set $tm-
+              pdir to the value of the first of whichever of the system  envi-
+              ronment  variables  TMPDIR or TEMP exists, otherwise to the cur-
+              rent directory.  Under other operating systems (expected  to  be
+              UNIX/Linux,  including  OS-X),  the  default is the value of the
+              system environment  variable  TMPDIR  if  it  exists,  otherwise
+              "/tmp".
 
+       $use_make_for_missing_files [0]
+              Whether to use make to try and make files that are missing after
+              a run of *latex, and for which a custom dependency has not  been
+              found.   This  is  generally useful only when latexmk is used as
+              part of a bigger project which is built by using the  make  pro-
+              gram.
 
+              Note that once a missing file has been made, no further calls to
+              make will be made on a subsequent run of latexmk to  update  the
+              file.   Handling  this  problem is the job of a suitably defined
+              Makefile.  See the section "USING latexmk WITH make" for how  to
+              do  this.   The intent of calling make from latexmk is merely to
+              detect dependencies.
+
        $view ["default"]
-              Which  kind  of  file is to be previewed if a previewer is used.
-              The possible values are  "default",  "dvi",  "ps",  "pdf".   The
+              Which kind of file is to be previewed if a  previewer  is  used.
+              The  possible  values  are  "default",  "dvi", "ps", "pdf".  The
               value of "default" means that the "highest" of the kinds of file
               generated is to be used (among .dvi, .ps and .pdf).
 
 
        $warnings_as_errors [0]
-              Normally latexmk copies the behavior of latex in treating  unde-
-              fined  references  and citations and multiply defined references
-              as conditions that give a warning but not an error.   The  vari-
+              Normally  latexmk copies the behavior of latex in treating unde-
+              fined references and citations and multiply  defined  references
+              as  conditions  that give a warning but not an error.  The vari-
               able $warnings_as_errors controls whether this behavior is modi-
               fied.
 
-              When the variable is non-zero, latexmk at the  end  of  its  run
-              will  return  a  non-zero status code to the operating system if
-              any of the files processed gives a warning about  problems  with
+              When  the  variable  is  non-zero, latexmk at the end of its run
+              will return a non-zero status code to the  operating  system  if
+              any  of  the files processed gives a warning about problems with
               citations or references (i.e., undefined citations or references
               or multiply defined references).  This is after latexmk has com-
-              pleted  all  the runs it needs to try and resolve references and
-              citations.  Thus $warnings_as_errors being  nonzero  causes  la-
+              pleted all the runs it needs to try and resolve  references  and
+              citations.   Thus  $warnings_as_errors  being nonzero causes la-
               texmk to treat such warnings as errors, but only when they occur
               on the last run of *latex and only after processing is complete.
-              A  non-zero value $warnings_as_errors can be set by the command-
+              A non-zero value $warnings_as_errors can be set by the  command-
               line option -Werror.
 
               The default behavior is normally satisfactory in the usual edit-
-              compile-edit  cycle.  But, for example, latexmk can also be used
-              as part of a build process for some bigger  project,  e.g.,  for
-              creating  documentation  in the build of a software application.
-              Then it is often sensible to treat citation and reference  warn-
-              ings  as  errors  that  require  the overall build process to be
-              aborted.  Of course, since multiple runs of *latex are generally
-              needed  to resolve references and citations, what matters is not
-              the warnings on the first run, but the warnings on the last run;
-              latexmk takes this into account appropriately.
+              compile-edit cycle.  But, for example, latexmk can also be  used
 
-              In  addition,  when  preview-continuous mode is used, a non-zero
-              value for $warnings_as_errors changes the use  of  the  commands
-              $failure_cmd,  $warning_cmd,  and  $success_cmd after a complia-
-              tion.  If there are citation or reference warnings, but no other
-              errors,  the  behavior is as follows. If $warning_cmd is set, it
-              is used.  If it is not set, then then if $warnings_as_errors  is
-              non-zero  and $failure_cmd is set, then $failure_cmd.  Otherwise
-              $success_cmd is used, if it is set.  (The foregoing  explanation
-              is rather complicated, because latexmk has to deal with the case
-              that one or more of the commands isn't set.)
 
 
-       $xdv_mode [0]
-              If one, generate an xdv version of the document by use of  xela-
-              tex.
+                                7 January 2023                              65
 
 
 
 
 
-                               18 November 2022                             63
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+              as  part  of  a build process for some bigger project, e.g., for
+              creating documentation in the build of a  software  application.
+              Then  it is often sensible to treat citation and reference warn-
+              ings as errors that require the  overall  build  process  to  be
+              aborted.  Of course, since multiple runs of *latex are generally
+              needed to resolve references and citations, what matters is  not
+              the warnings on the first run, but the warnings on the last run;
+              latexmk takes this into account appropriately.
 
+              In addition, when preview-continuous mode is  used,  a  non-zero
+              value  for  $warnings_as_errors  changes the use of the commands
+              $failure_cmd, $warning_cmd, and $success_cmd  after  a  complia-
+              tion.  If there are citation or reference warnings, but no other
+              errors, the behavior is as follows. If $warning_cmd is  set,  it
+              is  used.  If it is not set, then then if $warnings_as_errors is
+              non-zero and $failure_cmd is set, then $failure_cmd.   Otherwise
+              $success_cmd  is used, if it is set.  (The foregoing explanation
+              is rather complicated, because latexmk has to deal with the case
+              that one or more of the commands isn't set.)
 
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+       $xdv_mode [0]
+              If  one, generate an xdv version of the document by use of xela-
+              tex.
 
 
        $xdvipdfmx ["xdvipdfmx -E -o %D %O %S"]
 
-              The  program  to  make a pdf file from an xdv file (used in con-
+              The program to make a pdf file from an xdv file  (used  in  con-
               junction with xelatex when $pdf_mode=5).
 
        $xdvipdfmx_silent_switch ["-q"]
@@ -4171,65 +4329,65 @@
               Switch(es) for the xdvipdfmx program when silent mode is on.
 
        $xelatex ["xelatex %O %S"]
-              Specifies the command line for the LaTeX processing  program  of
-              when  the  xelatex program is called for.  See the documentation
-              of the -xelatex option for some special properties of  latexmk's
+              Specifies  the  command line for the LaTeX processing program of
+              when the xelatex program is called for.  See  the  documentation
+              of  the -xelatex option for some special properties of latexmk's
               use of xelatex.
 
-              Note  about xelatex: latexmk uses xelatex to make an .xdv rather
-              than .pdf file, with the .pdf file being created in  a  separate
+              Note about xelatex: latexmk uses xelatex to make an .xdv  rather
+              than  .pdf  file, with the .pdf file being created in a separate
               step.  This is enforced by the use of the -no-pdf option.  If %O
-              is part of the command for invoking xelatex, then  latexmk  will
+              is  part  of the command for invoking xelatex, then latexmk will
               insert the -no-pdf option automatically, otherwise you must pro-
-              vide the option yourself.  See the documentation for the  -pdfxe
+              vide  the option yourself.  See the documentation for the -pdfxe
               option for why latexmk makes a .xdv file rather than a .pdf file
               when xelatex is used.
 
-              To do a coordinated setting  of  all  of  $dvilualatex,  $latex,
-              $pdflatex,  $lualatex,  and  $xelatex, see the section "Advanced
+              To  do  a  coordinated  setting  of all of $dvilualatex, $latex,
+              $pdflatex, $lualatex, and $xelatex, see  the  section  "Advanced
               Configuration".
 
 
-       %xelatex_input_extensions
-              This variable specifies the extensions tried by latexmk when  it
-              finds  that  an xelatex run resulted in an error that a file has
-              not been found, and the file  is  given  without  an  extension.
-              This  typically  happens  when  LaTeX  commands of the form \in-
-              put{file} or \includegraphics{figure}, when the relevant  source
-              file does not exist.
 
-              In  this  situation, latexmk searches for custom dependencies to
-              make the missing file(s), but restricts  it  to  the  extensions
-              specified  by  the  variable %xelatex_input_extensions.  The de-
-              fault extensions are 'tex', 'pdf', 'jpg, and 'png'.
 
-              See details of the %latex_input_extensions for other information
-              that equally applies to %xelatex_input_extensions.
 
-       $xelatex_silent_switch ["-interaction=batchmode"]
-              Switch(es)  for  the  xelatex program (specified in the variable
-              $xelatex) when silent mode is on.
+                                7 January 2023                              66
 
-              See details of the $latex_silent_switch  for  other  information
-              that equally applies to $xelatex_silent_switch.
 
 
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+       %xelatex_input_extensions
+              This  variable specifies the extensions tried by latexmk when it
+              finds that an xelatex run resulted in an error that a  file  has
+              not  been  found,  and  the  file is given without an extension.
+              This typically happens when LaTeX  commands  of  the  form  \in-
+              put{file}  or \includegraphics{figure}, when the relevant source
+              file does not exist.
 
-                               18 November 2022                             64
+              In this situation, latexmk searches for custom  dependencies  to
+              make  the  missing  file(s),  but restricts it to the extensions
+              specified by the variable  %xelatex_input_extensions.   The  de-
+              fault extensions are 'tex', 'pdf', 'jpg, and 'png'.
 
+              See details of the %latex_input_extensions for other information
+              that equally applies to %xelatex_input_extensions.
 
+       $xelatex_silent_switch ["-interaction=batchmode"]
+              Switch(es) for the xelatex program (specified  in  the  variable
+              $xelatex) when silent mode is on.
 
+              See  details  of  the $latex_silent_switch for other information
+              that equally applies to $xelatex_silent_switch.
 
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
 CUSTOM DEPENDENCIES
-       In  any RC file a set of custom dependencies can be set up to convert a
+       In any RC file a set of custom dependencies can be set up to convert  a
        file with one extension to a file with another.  An example use of this
        would be to allow latexmk to convert a .fig file to .eps to be included
        in the .tex file.
@@ -4237,9 +4395,9 @@
 
    Defining a custom dependency:
        The old method of configuring latexmk to use a custom dependency was to
-       directly  manipulate  the @cus_dep_list array that contains information
-       defining the custom dependencies.  (See  the  section  "Old  Method  of
-       Defining  Custom  Dependencies"  for details.) This method still works,
+       directly manipulate the @cus_dep_list array that  contains  information
+       defining  the  custom  dependencies.   (See  the section "Old Method of
+       Defining Custom Dependencies" for details.) This  method  still  works,
        but is no longer preferred.
 
        A better method is to use the subroutines that allow convenient manipu-
@@ -4252,92 +4410,107 @@
        The arguments are as follows:
 
        from extension:
-              The  extension  of the file we are converting from (e.g. "fig").
+              The extension of the file we are converting from  (e.g.  "fig").
               It is specified without a period.
 
+
+
+
+
+                                7 January 2023                              67
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
        to extension:
               The extension of the file we are converting to (e.g. "eps").  It
               is specified without a period.
 
-       must:  If  non-zero,  the file from which we are converting must exist,
-              if it doesn't exist latexmk will give an error message and  exit
+       must:  If non-zero, the file from which we are converting  must  exist,
+              if  it doesn't exist latexmk will give an error message and exit
               unless the -f option is specified.  If must is zero and the file
-              we are converting from doesn't exist, then no action  is  taken.
+              we  are  converting from doesn't exist, then no action is taken.
               Generally, the appropriate value of must is zero.
 
        function:
-              The  name  of the subroutine that latexmk should call to perform
-              the file conversion.  The first argument to  the  subroutine  is
+              The name of the subroutine that latexmk should call  to  perform
+              the  file  conversion.   The first argument to the subroutine is
               the base name of the file to be converted without any extension.
-              The subroutines are declared in the syntax of Perl.   The  func-
-              tion  should  return 0 if it was successful and a nonzero number
+              The  subroutines  are declared in the syntax of Perl.  The func-
+              tion should return 0 if it was successful and a  nonzero  number
               if it failed.
 
 
-       Naturally add_cus_dep adds a custom dependency with the specified  from
-       and  to extensions.  If a custom dependency has been previously defined
-       (e.g., in an rcfile that was read earlier), then it is replaced by  the
+       Naturally  add_cus_dep adds a custom dependency with the specified from
+       and to extensions.  If a custom dependency has been previously  defined
+       (e.g.,  in an rcfile that was read earlier), then it is replaced by the
        new one.
 
-       The  subroutine remove_cus_dep removes the specified custom dependency.
+       The subroutine remove_cus_dep removes the specified custom  dependency.
        The subroutine show_cus_dep causes a list of the currently defined cus-
        tom dependencies to be sent to the screen output.
 
 
-
-                               18 November 2022                             65
-
-
-
-
-
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
    How custom dependencies are used:
        An instance of a custom dependency rule is created whenever latexmk de-
-       tects that a run of *latex needs to read a file, like a graphics  file,
-       whose  extension  is the to-extension of a custom dependency.  Then la-
-       texmk examines whether a file exists with the same name, but  with  the
-       corresponding  from-extension,  as  specified in the custom-dependency.
-       If it does, then a corresponding instance of the custom  dependency  is
-       created,  after which the rule is invoked whenever the destination file
+       tects  that a run of *latex needs to read a file, like a graphics file,
+       whose extension is the to-extension of a custom dependency.   Then  la-
+       texmk  examines  whether a file exists with the same name, but with the
+       corresponding from-extension, as specified  in  the  custom-dependency.
+       If  it  does, then a corresponding instance of the custom dependency is
+       created, after which the rule is invoked whenever the destination  file
        (the one with the to-extension) is out-of-date with respect to the cor-
        responding source file.
 
-       To  make the new destination file, the Perl subroutine specified in the
+       To make the new destination file, the Perl subroutine specified in  the
        rule is invoked, with an argument that is the base name of the files in
-       question.   Simple cases just involve a subroutine invoking an external
-       program; this can be done by following the  templates  below,  even  by
-       those  without  knowledge of the Perl programming language.  Of course,
+       question.  Simple cases just involve a subroutine invoking an  external
+       program;  this  can  be  done by following the templates below, even by
+       those without knowledge of the Perl programming language.   Of  course,
        experts could do something much more elaborate.
 
-       One item in the specification of each custom-dependency  rule,  labeled
-       "must"  above, specifies how the rule should be applied when the source
+       One  item  in the specification of each custom-dependency rule, labeled
+       "must" above, specifies how the rule should be applied when the  source
        file fails to exist.
 
-       When latex reports that an input file (e.g., a graphics file) does  not
+       When  latex reports that an input file (e.g., a graphics file) does not
        exist, latexmk tries to find a source file and a custom dependency that
        can be used to make it.  If it succeeds, then it creates an instance of
-       the  custom  dependency  and invokes it to make the missing file, after
+
+
+
+                                7 January 2023                              68
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
+       the custom dependency and invokes it to make the  missing  file,  after
        which the next pass of latex etc will be able to read the newly created
        file.
 
-       Note  for  advanced  usage: The operating system's environment variable
+       Note for advanced usage: The operating  system's  environment  variable
        TEXINPUTS can be used to specify a search path for finding files by la-
-       tex  etc.   Correspondingly,  when  a missing file is reported, latexmk
-       looks in the directories specified in TEXINPUTS as well as in the  cur-
-       rent  directory, to find a source file from which an instance of a cus-
+       tex etc.  Correspondingly, when a missing  file  is  reported,  latexmk
+       looks  in the directories specified in TEXINPUTS as well as in the cur-
+       rent directory, to find a source file from which an instance of a  cus-
        tom dependency can be used to make the missing file.
 
 
    Function to implement custom dependency, traditional method:
-       The function that implements a custom dependency gets  the  information
+       The  function  that implements a custom dependency gets the information
        on the files to be processed in two ways.  The first is through its one
-       argument; the argument contains the base name of the source and  desti-
+       argument;  the argument contains the base name of the source and desti-
        nation files.  The second way is described later.
 
-       A  simple and typical example of code in an initialization rcfile using
+       A simple and typical example of code in an initialization rcfile  using
        the first method is:
 
            add_cus_dep( 'fig', 'eps', 0, 'fig2eps' );
@@ -4345,166 +4518,154 @@
                system( "fig2dev -Leps \"$_[0].fig\" \"$_[0].eps\"" );
            }
 
-       The first line adds a custom dependency that converts a file  with  ex-
+       The  first  line adds a custom dependency that converts a file with ex-
        tension "fig", as created by the xfig program, to an encapsulated post-
-       script file, with  extension  "eps".   The  remaining  lines  define  a
+       script  file,  with extension "eps".  The remaining lines define a sub-
+       routine that carries out the conversion.   If  a  rule  for  converting
+       "fig"  to  "eps"  files already exists (e.g., from a previously read-in
+       initialization file), the latexmk will delete this rule  before  making
+       the new one.
 
+       Suppose  latexmk  is  using this rule to convert a file "figure.fig" to
+       "figure.eps".  Then it will invoke the fig2eps  subroutine  defined  in
+       the  above  code with a single argument "figure", which is the basename
+       of each of the files (possibly with a path component).   This  argument
+       is  referred to by Perl as $_[0].  In the example above, the subroutine
+       uses the Perl command system to invoke the program fig2dev.  The double
+       quotes around the string are a Perl idiom that signify that each string
+       of the form of a variable name, $_[0] in this case, is  to  be  substi-
+       tuted by its value.
 
+       If  the  return  value of the subroutine is non-zero, then latexmk will
+       assume an error occurred during the execution of  the  subroutine.   In
+       the  above  example, no explicit return value is given, and instead the
+       return value is the value returned by the last  (and  only)  statement,
+       i.e., the invocation of system, which returns the value 0 on success.
 
-                               18 November 2022                             66
+       If  you  use  pdflatex,  lualatex or xelatex instead of latex, then you
+       will probably prefer to convert your graphics files to pdf  format,  in
+       which  case  you would replace the above code in an initialization file
+       by
 
 
 
+                                7 January 2023                              69
 
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-       subroutine  that  carries out the conversion.  If a rule for converting
-       "fig" to "eps" files already exists (e.g., from  a  previously  read-in
-       initialization  file),  the latexmk will delete this rule before making
-       the new one.
 
-       Suppose latexmk is using this rule to convert a  file  "figure.fig"  to
-       "figure.eps".   Then  it  will invoke the fig2eps subroutine defined in
-       the above code with a single argument "figure", which is  the  basename
-       of  each  of the files (possibly with a path component).  This argument
-       is referred to by Perl as $_[0].  In the example above, the  subroutine
-       uses the Perl command system to invoke the program fig2dev.  The double
-       quotes around the string are a Perl idiom that signify that each string
-       of  the  form  of a variable name, $_[0] in this case, is to be substi-
-       tuted by its value.
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
-       If the return value of the subroutine is non-zero,  then  latexmk  will
-       assume  an  error  occurred during the execution of the subroutine.  In
-       the above example, no explicit return value is given, and  instead  the
-       return  value  is  the value returned by the last (and only) statement,
-       i.e., the invocation of system, which returns the value 0 on success.
 
-       If you use pdflatex, lualatex or xelatex instead  of  latex,  then  you
-       will  probably  prefer to convert your graphics files to pdf format, in
-       which case you would replace the above code in an  initialization  file
-       by
-
            add_cus_dep( 'fig', 'pdf, 0, 'fig2pdf' );
            sub fig2pdf {
                system( "fig2dev -Lpdf \"$_[0].fig\" \"$_[0].pdf\"" );
            }
 
-       Note  1: In the command lines given in the system commands in the above
-       examples, double quotes have been inserted around the file  names  (im-
-       plemented  by '\"' in the Perl language).  They immunize the running of
-       the program against special characters in filenames.  Very often  these
-       quotes  are  not  necessary, i.e., they can be omitted.  But it is nor-
-       mally safer to keep them in.  Even though the rules  for  quoting  vary
-       between  operating  systems,  command  shells  and individual pieces of
+       Note 1: In the command lines given in the system commands in the  above
+       examples,  double  quotes have been inserted around the file names (im-
+       plemented by '\"' in the Perl language).  They immunize the running  of
+       the  program against special characters in filenames.  Very often these
+       quotes are not necessary, i.e., they can be omitted.  But  it  is  nor-
+       mally  safer  to  keep them in.  Even though the rules for quoting vary
+       between operating systems, command  shells  and  individual  pieces  of
        software, the quotes in the above examples do not cause problems in the
        cases I have tested.
 
-       Note  2:  One  case in which the quotes are important is when the files
-       are in a subdirectory and your operating system is  Microsoft  Windows.
-       Then  the  separator character for directory components can be either a
-       forward slash '/' or Microsoft's more usual backward slash  '\'.   For-
-       ward  slashes  are  generated  by  latexmk, to maintain its sanity from
-       software like MiKTeX that mixes both directory  separators;  but  their
+       Note 2: One case in which the quotes are important is  when  the  files
+       are  in  a subdirectory and your operating system is Microsoft Windows.
+       Then the separator character for directory components can be  either  a
+       forward  slash  '/' or Microsoft's more usual backward slash '\'.  For-
+       ward slashes are generated by latexmk,  to  maintain  its  sanity  from
+       software  like  MiKTeX  that mixes both directory separators; but their
        correct use normally requires quoted filenames.  (See a log file from a
-       run of MiKTeX (at least in v. 2.9) for an example of the  use  of  both
+       run  of  MiKTeX  (at least in v. 2.9) for an example of the use of both
        directory separators.)
 
-       Note  3:  The subroutines implementing custom dependencies in the exam-
-       ples given just have  a  single  line  invoking  an  external  program.
-       That's  the usual situation.  But since the subroutines are in the Perl
+       Note 3: The subroutines implementing custom dependencies in  the  exam-
+       ples  given  just  have  a  single  line  invoking an external program.
+       That's the usual situation.  But since the subroutines are in the  Perl
+       language,  you  can  implement  much more complicated processing if you
+       need it.
 
 
+   Removing custom dependencies, and when you might need to do this:
+       If you have some general custom dependencies defined in the  system  or
+       user  initialization  file,  you may find that for a particular project
+       they are undesirable.  So you might want to delete the  unneeded  ones.
+       A  situation  where this would be desirable is where there are multiple
+       custom dependencies with the same from-extension or the same  to-exten-
+       sion.  In  that case, latexmk might choose a different one from the one
+       you want for a specific project.  As an example, to remove any "fig" to
+       "eps" rule you would use:
 
-                               18 November 2022                             67
+           remove_cus_dep( 'fig', 'eps' );
 
+       If  you  have  complicated sets of custom dependencies, you may want to
+       get a listing of the custom dependencies.  This is done  by  using  the
+       line
 
+           show_cus_dep();
 
+       in an initialization file.
 
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-       language, you can implement much more  complicated  processing  if  you
-       need it.
 
 
-   Removing custom dependencies, and when you might need to do this:
-       If  you  have some general custom dependencies defined in the system or
-       user initialization file, you may find that for  a  particular  project
-       they  are  undesirable.  So you might want to delete the unneeded ones.
-       A situation where this would be desirable is where there  are  multiple
-       custom  dependencies with the same from-extension or the same to-exten-
-       sion. In that case, latexmk might choose a different one from  the  one
-       you want for a specific project.  As an example, to remove any "fig" to
-       "eps" rule you would use:
+                                7 January 2023                              70
 
-           remove_cus_dep( 'fig', 'eps' );
 
-       If you have complicated sets of custom dependencies, you  may  want  to
-       get  a  listing  of the custom dependencies.  This is done by using the
-       line
 
-           show_cus_dep();
 
-       in an initialization file.
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
+
    Function implementing custom dependency, alternative methods:
        So far the examples for functions to implement custom dependencies have
        used the argument of the function to specify the base name of converted
-       file.  This method has been available since very old  versions  of  la-
+       file.   This  method  has been available since very old versions of la-
        texmk, and many examples can be found, e.g., on the web.
 
-       However  in later versions of latexmk the internal structure of the im-
+       However in later versions of latexmk the internal structure of the  im-
        plementation of its "rules" for the steps of processing, including cus-
        tom dependencies, became much more powerful.  The function implementing
        a custom dependency is executed within a special context where a number
-       of  extra  variables  and subroutines are defined.  Publicly documented
-       ones, intended to be long-term stable,  are  listed  below,  under  the
+       of extra variables and subroutines are  defined.   Publicly  documented
+       ones,  intended  to  be  long-term  stable, are listed below, under the
        heading "Variables and subroutines for processing a rule".
 
-       Examples  of  their  use is given in the following examples, concerning
+       Examples of their use is given in the  following  examples,  concerning
        multiple index files and glossaries.
 
-       The only index-file conversion built-in to latexmk is  from  an  ".idx"
-       file  written on one run of *latex to an ".ind" file to be read in on a
-       subsequent run.  But with the index.sty package, for example,  you  can
-       create  extra indexes with extensions that you configure.  Latexmk does
+       The  only  index-file  conversion built-in to latexmk is from an ".idx"
+       file written on one run of *latex to an ".ind" file to be read in on  a
+       subsequent  run.   But with the index.sty package, for example, you can
+       create extra indexes with extensions that you configure.  Latexmk  does
        not know how to deduce the extensions from the information it has.  But
-       you  can  easily  write a custom dependency.  For example if your latex
+       you can easily write a custom dependency.  For example  if  your  latex
        file uses the command "\newindex{special}{ndx}{nnd}{Special index}" you
-       will  need  to  get latexmk to convert files with the extension .ndx to
-       .nnd.  The most elementary method is to define a custom  dependency  as
+       will need to get latexmk to convert files with the  extension  .ndx  to
+       .nnd.   The  most elementary method is to define a custom dependency as
        follows:
 
            add_cus_dep( 'ndx', 'nnd', 0, 'ndx2nnd' );
-
-
-
-                               18 November 2022                             68
-
-
-
-
-
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
            sub ndx2nnd {
                return system( "makeindex -o \"$_[0].nnd\" \"$_[0].ndx\"" );
            }
            push @generated_exts, 'ndx', 'nnd';
 
-       Notice  the  added line compared with earlier examples.  The extra line
+       Notice the added line compared with earlier examples.  The  extra  line
        gets the extensions "ndx" and "nnd" added to the list of extensions for
        generated files; then the extra index files will be deleted by clean-up
        operations
 
-       But if you have yet more indexes with yet different  extensions,  e.g.,
-       "adx"  and  "and", then you will need a separate function for each pair
-       of extensions.  This is quite annoying.   You  can  use  the  Run_subst
+       But  if  you have yet more indexes with yet different extensions, e.g.,
+       "adx" and "and", then you will need a separate function for  each  pair
+       of  extensions.   This  is  quite  annoying.  You can use the Run_subst
        function to simplify the definitions to use a single function:
 
            add_cus_dep( 'ndx', 'nnd', 0, 'dx2nd' );
@@ -4517,6 +4678,18 @@
        You could also instead use
 
            add_cus_dep( 'ndx', 'nnd', 0, 'dx2nd' );
+
+
+
+                                7 January 2023                              71
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
            add_cus_dep( 'adx', 'and', 0, 'dx2nd' );
            sub dx2nd {
                return Run_subst( $makeindex );
@@ -4523,71 +4696,71 @@
            }
            push @generated_exts, 'ndx', 'nnd', 'adx', 'and';
 
-       This  last example uses the command specification in $makeindex, and so
-       any customization you have made for the standard index also applies  to
+       This last example uses the command specification in $makeindex, and  so
+       any  customization you have made for the standard index also applies to
        your extra indexes.
 
        Similar techniques can be applied for glossaries.
 
        Those of you with experience with Makefiles, may get concerned that the
-       .ndx file is written during a run of *latex and is  always  later  than
+       .ndx  file  is  written during a run of *latex and is always later than
        the .nnd last read in.  Thus the .nnd appears to be perpetually out-of-
-       date.  This situation, of circular dependencies, is endemic  to  latex,
-       and  is  one  of the issues that latexmk is programmed to overcome.  It
-       examines the contents of the files (by use of  a  checksum),  and  only
+       date.   This  situation, of circular dependencies, is endemic to latex,
+       and is one of the issues that latexmk is programmed  to  overcome.   It
+       examines  the  contents  of  the files (by use of a checksum), and only
        does a remake when the file contents have actually changed.
 
-       Of  course  if you choose to write random data to the .nnd (or the .aux
-       file, etc) that changes on each new run, then you will have a  problem.
+       Of course if you choose to write random data to the .nnd (or  the  .aux
+       file,  etc) that changes on each new run, then you will have a problem.
        For real experts: See the %hash_calc_ignore_pattern if you have to deal
        with such problems.
 
 
    Old Method of Defining Custom Dependencies:
-       In much older versions of latexmk, the only method of  defining  custom
-       dependencies   was   to   directly   manipulate  the  table  of  custom
+       In  much  older versions of latexmk, the only method of defining custom
+       dependencies was to directly manipulate the table of  custom  dependen-
+       cies.  This is contained in the @cus_dep_list array.  It is an array of
+       strings, and each string in the array has four items in it, each  sepa-
+       rated  by  a  space,  the  from-extension, the to-extension, the "must"
+       item, and the name of the subroutine for the custom dependency.   These
+       were all defined above.
 
+       An example of the old method of defining custom dependencies is as fol-
+       lows. It is the code in an RC file to ensure  automatic  conversion  of
+       .fig files to .eps files:
 
+           push @cus_dep_list, "fig eps 0 fig2eps";
+           sub fig2eps {
+               return system( "fig2dev -Lps \"$_[0].fig\" \"$_[0].eps\"" );
+           }
 
-                               18 November 2022                             69
+       This  method  still  works,  and is almost equivalent to the code given
+       earlier that used the add_cus_dep subroutine.  However, the old  method
+       doesn't  delete any previous custom-dependency for the same conversion.
+       So the new method is preferable.
 
 
 
+ADVANCED CONFIGURATION: Some extra resources and advanced tricks
+       For most purposes, simple configuration for latexmk along the lines  of
+       the  examples  given  is  sufficient.  But sometimes you need something
 
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
+                                7 January 2023                              72
 
-       dependencies.  This is contained in the @cus_dep_list array.  It is  an
-       array  of  strings,  and each string in the array has four items in it,
-       each separated by a space, the from-extension,  the  to-extension,  the
-       "must"  item, and the name of the subroutine for the custom dependency.
-       These were all defined above.
 
-       An example of the old method of defining custom dependencies is as fol-
-       lows.  It  is  the code in an RC file to ensure automatic conversion of
-       .fig files to .eps files:
 
-           push @cus_dep_list, "fig eps 0 fig2eps";
-           sub fig2eps {
-               return system( "fig2dev -Lps \"$_[0].fig\" \"$_[0].eps\"" );
-           }
 
-       This method still works, and is almost equivalent  to  the  code  given
-       earlier  that used the add_cus_dep subroutine.  However, the old method
-       doesn't delete any previous custom-dependency for the same  conversion.
-       So the new method is preferable.
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-ADVANCED CONFIGURATION: Some extra resources and advanced tricks
-       For  most purposes, simple configuration for latexmk along the lines of
-       the examples given is sufficient.  But  sometimes  you  need  something
-       harder.   In this section, I indicate some extra possibilities.  Gener-
-       ally to use these, you need to be fluent in the  Perl  language,  since
+       harder.  In this section, I indicate some extra possibilities.   Gener-
+       ally  to  use  these, you need to be fluent in the Perl language, since
        this is what is used in the rc files.
 
-       See  also the section DEALING WITH ERRORS, PROBLEMS, ETC.  See also the
+       See also the section DEALING WITH ERRORS, PROBLEMS, ETC.  See also  the
        examples in the directory example_rcfiles in the latexmk distributions.
        Even if none of the examples apply to your case, they may give you use-
        ful ideas
@@ -4596,13 +4769,13 @@
    Utility subroutines
        ensure_path( var, values ...)
 
-              The first parameter is the name of one of the system's  environ-
-              ment  variables  for search paths.  The remaining parameters are
-              values that should be in the variable.  For each  of  the  value
-              parameters,  if  it  isn't  already  in the variable, then it is
+              The  first parameter is the name of one of the system's environ-
+              ment variables for search paths.  The remaining  parameters  are
+              values  that  should  be in the variable.  For each of the value
+              parameters, if it isn't already in  the  variable,  then  it  is
               prepended to the variable; in that case the environment variable
-              is  created  if it doesn't already exist. For separating values,
-              the character appropriate the the operating system  is  used  --
+              is created if it doesn't already exist. For  separating  values,
+              the  character  appropriate  the the operating system is used --
               see the configuration variable $search_path_separator.
 
               Example:
@@ -4610,44 +4783,45 @@
                 ensure_path( 'TEXINPUTS', './custom_cls_sty_files//' );
 
               (In this example, the trailing '//' is documented by TeX systems
-              to mean that *latex search for files in the specified  directory
+              to  mean that *latex search for files in the specified directory
               and in all subdirectories.)
 
+              Technically  ensure_path  works  by  setting   Perl's   variable
+              $ENV{var},  where  var  is the name of the target variable.  The
+              changed value is then passed as an environment variable  to  any
+              invoked programs.
 
 
-                               18 November 2022                             70
+   Variables and subroutines for processing a rule
+       A step in the processing is called a rule. One possibility to implement
+       the processing of a rule is by a Perl subroutine.  This is  always  the
+       case  for  custom dependencies. Also, for any other rule, you can use a
+       subroutine by prefixing the command specification by the  word  "inter-
+       nal" -- see the section FORMAT OF COMMAND SPECIFICATIONS.
 
+       When  you use a subroutine for processing a rule, all the possibilities
+       of Perl programming are available, of course.  In addition, some of la-
+       texmk's  internal  variables  and  subroutines are available.  The ones
+       listed below are intended to be  available  to  (advanced)  users,  and
+       their specifications will generally have stability under upgrades. Gen-
+       erally, the variables should be treated as  read-only:  Changing  their
+       values  can  have  bad  consequences, since it is liable to mess up the
+       consistency of what latexmk is doing.
 
+       $rule  This variable has the name of the rule,  as  known  to  latexmk.
+              Note  that  the exact contents of this variable for a given rule
 
 
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+                                7 January 2023                              73
 
 
-              Technically   ensure_path   works  by  setting  Perl's  variable
-              $ENV{var}, where var is the name of the  target  variable.   The
-              changed  value  is then passed as an environment variable to any
-              invoked programs.
 
 
-   Variables and subroutines for processing a rule
-       A step in the processing is called a rule. One possibility to implement
-       the  processing  of a rule is by a Perl subroutine.  This is always the
-       case for custom dependencies. Also, for any other rule, you can  use  a
-       subroutine  by  prefixing the command specification by the word "inter-
-       nal" -- see the section FORMAT OF COMMAND SPECIFICATIONS.
 
-       When you use a subroutine for processing a rule, all the  possibilities
-       of Perl programming are available, of course.  In addition, some of la-
-       texmk's internal variables and subroutines  are  available.   The  ones
-       listed  below  are  intended  to  be available to (advanced) users, and
-       their specifications will generally have stability under upgrades. Gen-
-       erally,  the  variables  should be treated as read-only: Changing their
-       values can have bad consequences, since it is liable  to  mess  up  the
-       consistency of what latexmk is doing.
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
-       $rule  This  variable  has  the  name of the rule, as known to latexmk.
-              Note that the exact contents of this variable for a  given  rule
+
               may be dependent on the version of latexmk
 
        $$Psource
@@ -4655,51 +4829,39 @@
               dollar signs.
 
        $$Pdest
-              This gives the name of the main output file if  any.   Note  the
+              This  gives  the  name of the main output file if any.  Note the
               double dollar signs.
 
        rdb_ensure_file( $rule, file )
-              This  a subroutine that ensures that the given file is among the
+              This a subroutine that ensures that the given file is among  the
               source files for the specified rule.  It is typically used when,
-              during  the  processing of a rule, it is known that a particular
-              extra file is among the dependencies that latexmk  should  know,
+              during the processing of a rule, it is known that  a  particular
+              extra  file  is among the dependencies that latexmk should know,
               but its default methods don't find the dependency. Almost always
-              the first argument is the name of the rule currently being  pro-
+              the  first argument is the name of the rule currently being pro-
               cessed, so it is then appropriate to specify it by $rule.
 
-              For  examples of its use, see some of the files in the directory
-              example_rcfiles of latexmk's distribution.  Currently the  cases
-              that  use  this  subroutine  are bib2gls-latexmkrc, exceltex_la-
-              texmkrc and texinfo-latexmkrc.  These illustrate  typical  cases
-              where  latexmk's normal processing fails to detect certain extra
+              For examples of its use, see some of the files in the  directory
+              example_rcfiles  of latexmk's distribution.  Currently the cases
+              that use this  subroutine  are  bib2gls-latexmkrc,  exceltex_la-
+              texmkrc  and  texinfo-latexmkrc.  These illustrate typical cases
+              where latexmk's normal processing fails to detect certain  extra
               source files.
 
        rdb_remove_files( $rule, file, ... )
-              This subroutine removes one or more files  from  the  dependency
+              This  subroutine  removes  one or more files from the dependency
               list for the given rule.
 
-
-
-
-                               18 November 2022                             71
-
-
-
-
-
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
        rdb_list_source( $rule )
-              This  subroutine returns the list of source files (i.e., the de-
+              This subroutine returns the list of source files (i.e., the  de-
               pendency list) for the given rule.
 
        rdb_set_source( $rule, file, ... )
 
        rdb_set_source( $rule, @files )
-              This subroutine sets the dependency list for the given  rule  to
+              This  subroutine  sets the dependency list for the given rule to
               be the specified files.  Files that are already in the list have
-              unchanged information.  Files that were  not  in  the  list  are
+              unchanged  information.   Files  that  were  not in the list are
               added to it.  Files in the previous dependency list that are not
               in the newly specified list of files are removed from the depen-
               dency list.
@@ -4706,18 +4868,29 @@
 
        Run_subst( command_spec )
               This subroutine runs the command specified by command_spec.  The
-              specification is a string in the format listed  in  the  section
-              "Format  of Command Specifications".  An important action of the
+              specification  is  a  string in the format listed in the section
+              "Format of Command Specifications".  An important action of  the
               Run_subst is to make substitutions of placeholders, e.g., %S and
-              %D  for  source and destination files; these get substituted be-
+              %D for source and destination files; these get  substituted  be-
               fore the command is run.  In addition, the command after substi-
-              tution  is  printed  to  the screen unless latexmk is running in
+              tution is printed to the screen unless  latexmk  is  running  in
               silent mode.
 
 
+
+
+                                7 January 2023                              74
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
    Coordinated Setting of Commands for *latex
-       To set all of $dvilualatex, $latex, $pdflatex, $lualatex, and  $xelatex
-       to  a  common  pattern,  you  can use one of the following subroutines,
+       To  set all of $dvilualatex, $latex, $pdflatex, $lualatex, and $xelatex
+       to a common pattern, you can use  one  of  the  following  subroutines,
        std_tex_cmds, alt_tex_cmds, and set_tex_cmds.
 
        They work as follows
@@ -4725,70 +4898,69 @@
           &std_tex_cmds;
 
        This results in $latex = 'latex %O %S', and similarly for $dvilualatex,
-       $pdflatex,  $lualatex, and $xelatex.  Note the ampersand in the invoca-
+       $pdflatex, $lualatex, and $xelatex.  Note the ampersand in the  invoca-
        tion; this indicates to Perl that a subroutine is being called.
 
           &alt_tex_cmds;
 
        This results in $latex = 'latex %O %P', and similarly for $dvilualatex,
-       $pdflatex,  $lualatex, and $xelatex.  Note the ampersand in the invoca-
+       $pdflatex, $lualatex, and $xelatex.  Note the ampersand in the  invoca-
        tion; this indicates to Perl that a subroutine is being called.
 
          set_tex_cmds( CMD_SPEC );
 
-       Here CMD_SPEC is the command line without the program  name.  This  re-
-       sults  in  $latex = 'latex CMD_SPEC', and similarly for $pdflatex, $lu-
+       Here  CMD_SPEC  is  the command line without the program name. This re-
+       sults in $latex = 'latex CMD_SPEC', and similarly for  $pdflatex,  $lu-
        alatex, and $xelatex. An example would be
 
          set_tex_cmds( '--interaction=batchmode %O %S' );
 
 
+   Advanced configuration: Using latexmk with make
+       This  section  is targeted only at advanced users who use the make pro-
+       gram for complex projects, as for software development, with the depen-
+       dencies specified by a Makefile.
 
+       Now  the  basic  task  of latexmk is to run the appropriate programs to
+       make a viewable version of a LaTeX document.  However, the  usual  make
+       program  is not suited to this purpose for at least two reasons.  First
+       is that the use of LaTeX involves circular dependencies (e.g., via .aux
+       files), and these cannot be handled by the standard make program.  Sec-
+       ond is that in a large document the set  of  source  files  can  change
+       quite  frequently,  particularly  with included graphics files; in this
+       situation keeping a Makefile manually updated is inappropriate and  er-
+       ror-prone, especially when the dependencies can be determined automati-
+       cally.  Latexmk solves both of these problems robustly.
 
+       Thus for many standard LaTeX documents latexmk can be  used  by  itself
+       without  the  make program.  In a complex project it simply needs to be
+       suitably configured.  A standard configuration would be to define  cus-
+       tom  dependencies to make graphics files from their source files (e.g.,
+       as created by the xfig program).   Custom  dependencies  are  latexmk's
+       equivalent of pattern rules in Makefiles.
 
+       Nevertheless  there  are  projects for which a Makefile is appropriate,
+       and it is useful to know how to use latexmk from a Makefile.  A typical
+       example  would  be  to  generate  documentation for a software project.
 
-                               18 November 2022                             72
 
 
+                                7 January 2023                              75
 
 
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-   Advanced configuration: Using latexmk with make
-       This section is targeted only at advanced users who use the  make  pro-
-       gram for complex projects, as for software development, with the depen-
-       dencies specified by a Makefile.
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
-       Now the basic task of latexmk is to run  the  appropriate  programs  to
-       make  a  viewable version of a LaTeX document.  However, the usual make
-       program is not suited to this purpose for at least two reasons.   First
-       is that the use of LaTeX involves circular dependencies (e.g., via .aux
-       files), and these cannot be handled by the standard make program.  Sec-
-       ond  is  that  in  a  large document the set of source files can change
-       quite frequently, particularly with included graphics  files;  in  this
-       situation  keeping a Makefile manually updated is inappropriate and er-
-       ror-prone, especially when the dependencies can be determined automati-
-       cally.  Latexmk solves both of these problems robustly.
 
-       Thus  for  many  standard LaTeX documents latexmk can be used by itself
-       without the make program.  In a complex project it simply needs  to  be
-       suitably  configured.  A standard configuration would be to define cus-
-       tom dependencies to make graphics files from their source files  (e.g.,
-       as  created  by  the  xfig program).  Custom dependencies are latexmk's
-       equivalent of pattern rules in Makefiles.
-
-       Nevertheless there are projects for which a  Makefile  is  appropriate,
-       and it is useful to know how to use latexmk from a Makefile.  A typical
-       example would be to generate documentation for a software project.  Po-
-       tentially  the  interaction  with the rest of the rules in the Makefile
+       Potentially the interaction with the rest of the rules in the  Makefile
        could be quite complicated, for example if some of the source files for
        a LaTeX document are generated by the project's software.
 
        In this section, I give a couple of examples of how latexmk can be use-
-       fully invoked from a Makefile.  The examples use specific  features  of
-       current  versions  of  GNU make, which is the default on both linux and
+       fully  invoked  from a Makefile.  The examples use specific features of
+       current versions of GNU make, which is the default on  both  linux  and
        OS-X systems.  They may need modifications for other versions of make.
 
        The simplest method is simply to delegate all the relevant tasks to la-
@@ -4800,45 +4972,33 @@
            %.pdf : %.tex FORCE_MAKE
                latexmk -pdf -dvi- -ps- $<
 
-       (Note: the last line must be introduced by a tab for  the  Makefile  to
-       function  correctly!)  Naturally, if making try.pdf from its associated
-       LaTeX file try.tex were the only task to be performed, a direct use  of
-       latexmk  without  a  Makefile would normally be better.  The benefit of
-       using a Makefile for a LaTeX document would be  in  a  larger  project,
+       (Note:  the  last  line must be introduced by a tab for the Makefile to
+       function correctly!)  Naturally, if making try.pdf from its  associated
+       LaTeX  file try.tex were the only task to be performed, a direct use of
+       latexmk without a Makefile would normally be better.   The  benefit  of
+       using  a  Makefile  for  a LaTeX document would be in a larger project,
        where lines such as the above would be only be a small part of a larger
        Makefile.
 
        The above example has a pattern rule for making a .pdf file from a .tex
-       file,  and it is defined to use latexmk in the obvious way.  There is a
-
-
-
-                               18 November 2022                             73
-
-
-
-
-
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
+       file, and it is defined to use latexmk in the obvious way.  There is  a
        conventional  default  target  named  "all",  with  a  prerequisite  of
-       try.pdf.   So  when  make is invoked, by default it makes try.pdf.  The
-       only complication is  that  there  may  be  many  source  files  beyond
+       try.pdf.  So when make is invoked, by default it  makes  try.pdf.   The
+       only  complication  is  that  there  may  be  many  source files beyond
        try.tex, but these aren't specified in the Makefile, so changes in them
-       will not by themselves cause latexmk to be invoked.  Instead, the  pat-
-       tern  rule is equipped with a "phony" prerequisite FORCE_MAKE; this has
-       the effect of causing the rule to be always out-of-date,  so  that  la-
-       texmk  is always run.  It is latexmk that decides whether any action is
-       needed, e.g., a rerun of pdflatex.  Effectively the Makefile  delegates
-       all  decisions  to  latexmk, while make has no knowledge of the list of
+       will  not by themselves cause latexmk to be invoked.  Instead, the pat-
+       tern rule is equipped with a "phony" prerequisite FORCE_MAKE; this  has
+       the  effect  of  causing the rule to be always out-of-date, so that la-
+       texmk is always run.  It is latexmk that decides whether any action  is
+       needed,  e.g., a rerun of pdflatex.  Effectively the Makefile delegates
+       all decisions to latexmk, while make has no knowledge of  the  list  of
        source files except for primary LaTeX file for the  document.  If there
        are, for example, graphics files to be made, these must be made by cus-
        tom dependencies configured in latexmk.
 
-       But something better is needed in more complicated situations, for  ex-
+       But  something better is needed in more complicated situations, for ex-
        ample, when the making of graphics files needs to be specified by rules
-       in the Makefile.  To do this, one can use a Makefile like  the  follow-
+       in  the  Makefile.  To do this, one can use a Makefile like the follow-
        ing:
 
             TARGETS = document1.pdf document2.pdf
@@ -4848,6 +5008,18 @@
                   -e '@cus_dep_list = ();' \
                   -e 'show_cus_dep();'
             all : $(TARGETS)
+
+
+
+                                7 January 2023                              76
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
             $(foreach file,$(TARGETS),$(eval -include $(DEPS_DIR)/$(file)P))
             $(DEPS_DIR) :
                    mkdir $@
@@ -4857,59 +5029,47 @@
             %.pdf : %.fig
                    fig2dev -Lpdf $< $@
 
-       (Again,  the  lines  containing  the  commands  for the rules should be
+       (Again, the lines containing the  commands  for  the  rules  should  be
        started with tabs.)  This example was inspired by how GNU automake han-
        dles automatic dependency tracking of C source files.
 
-       After  each  run of latexmk, dependency information is put in a file in
-       the .deps subdirectory.  The Makefile causes these dependency files  to
+       After each run of latexmk, dependency information is put in a  file  in
+       the  .deps subdirectory.  The Makefile causes these dependency files to
        be read by make, which now has the full dependency information for each
-       target .pdf file.  To make things less trivial it  is  specificed  that
-       two  files document1.pdf and document2.pdf are the targets.  The depen-
+       target  .pdf  file.   To make things less trivial it is specificed that
+       two files document1.pdf and document2.pdf are the targets.  The  depen-
        dency files are .deps/document1.pdfP and .deps/document2.pdfP.
 
-       There is now no need for the phony prerequisite for the  rule  to  make
+       There  is  now  no need for the phony prerequisite for the rule to make
        .pdf files from .tex files.  But I have added a rule to make .pdf files
-       from .fig files produced by the xfig program; these are  commonly  used
-       for  graphics  insertions  in  LaTeX documents.  Latexmk is arranged to
+       from  .fig  files produced by the xfig program; these are commonly used
+       for graphics insertions in LaTeX documents.   Latexmk  is  arranged  to
        output a dependency file after each run.  It is given the -recorder op-
-       tion,  which  improves its detection of files generated during a run of
-       pdflatex; such files should not be in the dependency list.  The -e  op-
-       tions  are  used  to  turn off all custom dependencies, and to document
-
-
-
-                               18 November 2022                             74
-
-
-
-
-
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
-       this.  Instead the -use-make is used to delegate the making of  missing
+       tion, which improves its detection of files generated during a  run  of
+       pdflatex;  such files should not be in the dependency list.  The -e op-
+       tions are used to turn off all custom  dependencies,  and  to  document
+       this.   Instead the -use-make is used to delegate the making of missing
        files to make itself.
 
-       Suppose  in  the LaTeX file there is a command \includegraphics{graph},
-       and an xfig file "graph.fig" exists.  On a first run, pdflatex  reports
-       a  missing  file, named "graph". Latexmk succeeds in making "graph.pdf"
+       Suppose in the LaTeX file there is a  command  \includegraphics{graph},
+       and  an xfig file "graph.fig" exists.  On a first run, pdflatex reports
+       a missing file, named "graph". Latexmk succeeds in  making  "graph.pdf"
        by calling "make graph.pdf", and after completion of its work, it lists
        "fig.pdf" among the dependents of the file latexmk is making.  Then let
-       "fig.fig" be updated, and then let make be  run.   Make  first  remakes
+       "fig.fig"  be  updated,  and  then let make be run.  Make first remakes
        "fig.pdf", and only then reruns latexmk.
 
-       Thus  we  now  have  a method by which all the subsidiary processing is
+       Thus we now have a method by which all  the  subsidiary  processing  is
        delegated to make.
 
 
 NON_ASCII CHARACTERS IN FILENAMES, RC FILES, ETC
        Modern operating systems and file systems allow non-ASCII characters in
-       the  names  of  files  and  directories that encompass the full Unicode
+       the names of files and directories  that  encompass  the  full  Unicode
        range.  Mostly, latexmk deals with these correctly.  However, there are
-       some  situations in which there are problems, notably on Microsoft Win-
+       some situations in which there are problems, notably on Microsoft  Win-
        dows.  Prior to version 4.77, latexmk had problems with non-ASCII file-
-       names  on  Windows, even though there were no corresponding problems on
+       names on Windows, even though there were no corresponding  problems  on
        macOS and Linux.  These problems are corrected in the present version.
 
        DETAILS TO BE FILLED IN
@@ -4916,6 +5076,16 @@
 
 
 
+
+                                7 January 2023                              77
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
 SEE ALSO
        latex(1), bibtex(1), lualatex(1), pdflatex(1), xelatex(1).
 
@@ -4922,47 +5092,35 @@
 
 BUGS (SELECTED)
        Sometimes a viewer (gv) tries to read an updated .ps or .pdf file after
-       its  creation is started but before the file is complete.  Work around:
+       its creation is started but before the file is complete.  Work  around:
        manually refresh (or reopen) display.  Or use one of the other preview-
        ers and update methods.
 
-       (The  following  isn't  really a bug, but concerns features of preview-
-       ers.)  Preview continuous mode only works perfectly with  certain  pre-
-       viewers:  Xdvi  on  UNIX/Linux  works  for dvi files.  Gv on UNIX/Linux
-       works for both postscript and pdf.  Ghostview  on  UNIX/Linux  needs  a
-       manual  update (reopen); it views postscript and pdf.  Gsview under MS-
-       Windows works for both postscript and pdf, but only reads  the  updated
-       file  when  its  screen  is refreshed.  Acroread under UNIX/Linux views
-       pdf, but the file needs to be closed and reopened to  view  an  updated
-       version.   Under  MS-Windows,  acroread locks its input file and so the
-       pdf file cannot be updated.  (Remedy: configure latexmk  to  use  suma-
+       (The following isn't really a bug, but concerns  features  of  preview-
+       ers.)   Preview  continuous mode only works perfectly with certain pre-
+       viewers: Xdvi on UNIX/Linux works for  dvi  files.   Gv  on  UNIX/Linux
+       works  for  both  postscript  and pdf.  Ghostview on UNIX/Linux needs a
+       manual update (reopen); it views postscript and pdf.  Gsview under  MS-
+       Windows  works  for both postscript and pdf, but only reads the updated
+       file when its screen is refreshed.   Acroread  under  UNIX/Linux  views
+       pdf,  but  the  file needs to be closed and reopened to view an updated
+       version.  Under MS-Windows, acroread locks its input file  and  so  the
+       pdf  file  cannot  be updated.  (Remedy: configure latexmk to use suma-
        trapdf instead.)
 
 THANKS TO
-       Authors  of previous versions.  Many users with their feedback, and es-
+       Authors of previous versions.  Many users with their feedback, and  es-
        pecially David Coppit (username david at node coppit.org) who made many
-       useful  suggestions  that contributed to version 3, and Herbert Schulz.
-
-
-
-                               18 November 2022                             75
-
-
-
-
-
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
-       (Please note that the e-mail addresses are not written in  their  stan-
+       useful suggestions that contributed to version 3, and  Herbert  Schulz.
+       (Please  note  that the e-mail addresses are not written in their stan-
        dard form to avoid being harvested too easily.)
 
 AUTHOR
-       Current  version,  by  John Collins (Version 4.78).  Report bugs etc to
+       Current version, by John Collins (Version 4.79).  Report  bugs  etc  to
        his e-mail (jcc8 at psu.edu).
 
-       Released     version     can      be      obtained      from      CTAN:
-       <http://www.ctan.org/pkg/latexmk/>,   and  from  the  author's  website
+       Released      version      can      be      obtained     from     CTAN:
+       <http://www.ctan.org/pkg/latexmk/>,  and  from  the  author's   website
        <http://www.personal.psu.edu/jcc8/latexmk/>.
        Modifications and enhancements by Evan McLean (Version 2.0)
        Original script called "go" by David J. Musliner (RCS Version 3.2)
@@ -4985,32 +5143,6 @@
 
 
 
+                                7 January 2023                              78
 
 
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-                               18 November 2022                             76
-
-

Modified: trunk/Master/texmf-dist/scripts/latexmk/latexmk.pl
===================================================================
--- trunk/Master/texmf-dist/scripts/latexmk/latexmk.pl	2023-01-07 21:22:46 UTC (rev 65482)
+++ trunk/Master/texmf-dist/scripts/latexmk/latexmk.pl	2023-01-07 21:23:15 UTC (rev 65483)
@@ -1,8 +1,44 @@
 #!/usr/bin/env perl
 use warnings;
 
+# ???!!! TO DO 9 Aug 2022:
+#     0. RETHINK warning listing handling etc, including warnings as
+#        errors, bad warnings as errors.  Must systematize.  Code is too split
+#        up.
+# 1b. ===> In any case, check treatment of runs that give an error.
+# 2. Think generally through logic of error handling.  E.g., error in
+#    xelatex: should dvipdfmx be run?  (Or with config. variable for the
+#    post-primaries.)  Currently it's run.  Probably correct: viewed file,
+#    if it can be made, can be useful for error diagnosis.  Also:
+#    consistency between direct making of pdf file and indirect.
+#    But abort after error can also be useful.
+#    DONE 3. Are post-primaries guaranteed to be run in correct order?
+#    YES: See definition of @post_primary.
+# 4. Clean up rdb_diagnose_changes2.
+# COMMENTED OUT FOR NOW 5. Perhaps, remove use of kpsewhich in case of disappeared files?
+# 6. Review rdb_make and rdb_make1 again.
+# 7. Start in -pvc when prior run gave error: There's an error report after
+#    the first make.  Same outside -pvc if have error run, then run
+#    latexmk; it reports error from previous run.
+# 9, Re %pass and rdb_rerun_needed: Perhaps remove outside_make_loop, and
+#    have separate subroutine for use by make_preview_continuous, and
+#    standard rdb_rerun_needed calls it and then does its source_rule
+#    stuff.
+# 10. Do I need to make rdb_user_changes better?
+#
+# OK 12. Is classification of post_primary watertight?  They are intended to
+#     be outside any loop.  Start with target files, and call encountered
+#     rules post_primary until a primary is encountered.  That assumes that
+#     on the pathway to target from primary, source files are not generated
+#     by non-primary rules.
+#     There's no requirement for post_primaries to be outside dependency
+#     loops. The make algorithm handles that. All that matters is that this
+#     commonly so, and therefore we are doing an appropriate ordering of
+#     examination of rules, by pre-primary, primary, post-primary.
+#     Post-primaries always have primary as a prerequisite for the source
+#     files. 
 
-## Copyright John Collins 1998-2022
+## Copyright John Collins 1998-2023
 ##           (username jcc8 at node psu.edu)
 ##      (and thanks to David Coppit (username david at node coppit.org) 
 ##           for suggestions) 
@@ -43,8 +79,8 @@
 
 $my_name = 'latexmk';
 $My_name = 'Latexmk';
-$version_num = '4.78';
-$version_details = "$My_name, John Collins, 18 Nov. 2022. Version $version_num";
+$version_num = '4.79';
+$version_details = "$My_name, John Collins, 7 Jan. 2023. Version $version_num";
 
 use Config;
 use File::Basename;
@@ -82,6 +118,10 @@
 use Cwd "chdir";    # Ensure $ENV{PWD}  tracks cwd.
 use Digest::MD5;
 
+# **WARNING**: Don't import time; that overrides core function time(), and messes up
+#  
+use Time::HiRes;
+
 #################################################
 #
 #  Unicode set up to be used in latexmk
@@ -1304,9 +1344,14 @@
                         # To keep backward compatibility with older versions
                         # of latexmk, the default is to set
                         # $analyze_input_log_always to 1.
+$fls_uses_out_dir = 0;  # Whether fls file is to be in out directory (as with
+                        # pre-Oct-2020 MiKTeX), or in aux directory (as with
+                        # newer versions of MiKTeX).
+                        # If the implementation of *latex puts the fls file in
+                        # the other directory, I will copy it to the directory
+                        # I am configured to use.
 
 
-
 # Which kinds of file do I have requests to make?
 our ($dvi_mode, $pdf_mode, $postscript_mode, $xdv_mode,
      $cleanup_mode, $force_mode, $go_mode, $landscape_mode, $preview_mode, $preview_continuous_mode, $printout_mode );
@@ -1379,6 +1424,21 @@
 # Timing information
 # Whether to report processing time: 
 our $show_time = 0;
+
+# Whether times computed are clock times (HiRes) since Epoch, or are
+# processing times for this process and child processes, as reported by
+# times().  Second is the best, if accurate.  But on MSWin32, times()
+# appears not to included subprocess times, so we use clock time instead.
+our $times_are_clock = ($^O eq "MSWin32" );
+
+# Allowance for different granularity in time since Epoch and file mtime.
+# Needed in testing whether a file was generated during a run of a program.
+# FAT file system: 2 sec granularity. Others 1 sec or less.
+# Perl CORE's mtime in stat: 1 sec.
+# Perl CORE's time(): 1 sec.  Time::HiRes::time(): Much less than 1 sec.
+our $filetime_slop = 2;
+
+
 # Data for 1 run and global (ending in '0'):
 our ( $processing_time1, $processing_time0, @timings1, @timings0);
 &init_timing_all;
@@ -2206,7 +2266,7 @@
     &exit_help( "Bad options specified" );
 }
 
-print "$My_name: This is $version_details, version: $version_num.\n",
+print "$My_name: This is $version_details.\n",
    unless $silent;
 
 &config_to_mine;
@@ -2691,15 +2751,12 @@
                     );
         &rdb_set_rule_net;
     }
+
     # At this point, the file and rule databases are correctly initialized
     # either from the fdb_latexmk database (corresponding to the state at
     # the end of the previous run of latexmk), or from default initialization,
     # assisted by dependency information from log files about previous
     # run, if the log file exists.
-    # PERHAPS if fdb_latexmk doesn't exist but appropriate output files exist,
-    #   we could assume there was a previous run that completed.  Then new
-    #   run of *latex etc isn't needed until files are changed; then we
-    #   should set the file data from the on-disk state.
 
     if ( $cleanup_mode ) { &do_small_cleanup; }
     if ( $cleanup_mode == 1 ) { &do_extra_cleanup; }
@@ -2709,17 +2766,14 @@
         # No aux file => set up trivial aux file 
         #    and corresponding fdb_file.  Arrange them to provoke one run 
         #    as minimum, but no more if actual aux file is trivial.
-        #    (Useful on big files without cross references.)
+        #    (Useful on short simple files.)
         # If aux file doesn't exist, then any fdb file is surely
-        #    wrong.
-        # Previously, I had condition for this as being both aux and
-        #    fdb files failing to exist.  But it's not obvious what to
-        #    do if aux exists and fdb doesn't.  So I won't do anything.
+        #    wrong. So updating it to current state is sensible.
+        print( "No existing .aux file, so I'll make a simple one, and require run of *latex.\n")
+            unless $silent;
         &set_trivial_aux_fdb;
     }
 
-
-
     if ($go_mode == 3) {
         # Force primaries to be remade.
         if (!$silent) { print "Force *latex to be remade.\n"; }
@@ -3255,13 +3309,16 @@
     }
     #   ???!!!  REVISE
     foreach my $rule ( keys %rule_template ) {
-        my ( $cmd_type, $ext_cmd, $int_cmd, $source, $dest, $base, $DUMMY, $PA_extra_gen ) = @{$rule_template{$rule}};
+        my ( $cmd_type, $ext_cmd, $int_cmd, $source, $dest, $base,
+             $DUMMY, $PA_extra_gen, $PA_extra_source )
+            = @{$rule_template{$rule}};
         if ( ! $PA_extra_gen ) { $PA_extra_gen = []; }
+        if ( ! $PA_extra_source ) { $PA_extra_source = []; }
         my $needs_making = 0;
         # Substitute in the filename variables, since we will use
         # those for determining filenames.  But delay expanding $cmd 
         # until run time, in case of changes.
-        foreach ($base, $source, $dest, @$PA_extra_gen ) {
+        foreach ($base, $source, $dest, @$PA_extra_gen, @$PA_extra_source ) {
             s/%R/$root_filename/g;
             s/%Y/$aux_dir1/;
             s/%Z/$out_dir1/;
@@ -3272,7 +3329,7 @@
         }
         rdb_create_rule( $rule, $cmd_type, $ext_cmd, $int_cmd, $DUMMY, 
                          $source, $dest, $base,
-                         $needs_making, undef, undef, 1, $PA_extra_gen );
+                         $needs_making, undef, undef, 1, $PA_extra_gen, $PA_extra_source );
     } # End rule iteration
 
     # At this point, all the rules are active.
@@ -3356,11 +3413,11 @@
     my $PA_update = ['do_update_view', $viewer_update_method, $viewer_update_signal, 0, 1];
 
     %rule_list = (
-        'dvilualatex'  => [ 'primary',  "$dvilualatex",  '',      "%T",        $dvi_name,  "%R",   1, [$log_name] ],
-        'latex'     => [ 'primary',  "$latex",     '',            "%T",        $dvi_name,  "%R",   1, [$log_name] ],
-        'lualatex'  => [ 'primary',  "$lualatex",  '',            "%T",        $pdf_name,  "%R",   1, [$log_name] ],
-        'pdflatex'  => [ 'primary',  "$pdflatex",  '',            "%T",        $pdf_name,  "%R",   1, [$log_name] ],
-        'xelatex'   => [ 'primary',  "$xelatex",   '',            "%T",        $xdv_name,  "%R",   1, [$log_name] ],
+        'dvilualatex'  => [ 'primary',  "$dvilualatex",  '',      "%T",        $dvi_name,  "%R",   1, [$aux_main, $log_name], [$aux_main] ],
+        'latex'     => [ 'primary',  "$latex",     '',            "%T",        $dvi_name,  "%R",   1, [$aux_main, $log_name], [$aux_main] ],
+        'lualatex'  => [ 'primary',  "$lualatex",  '',            "%T",        $pdf_name,  "%R",   1, [$aux_main, $log_name], [$aux_main] ],
+        'pdflatex'  => [ 'primary',  "$pdflatex",  '',            "%T",        $pdf_name,  "%R",   1, [$aux_main, $log_name], [$aux_main] ],
+        'xelatex'   => [ 'primary',  "$xelatex",   '',            "%T",        $xdv_name,  "%R",   1, [$aux_main, $log_name], [$aux_main] ],
         'dvipdf'    => [ 'external', "$dvipdf",    'do_viewfile', $dvi_final,  $pdf_name,  "%Z%R", 1 ],
         'xdvipdfmx' => [ 'external', "$xdvipdfmx", 'do_viewfile', $xdv_final,  $pdf_name,  "%Z%R", 1 ],
         'dvips'     => [ 'external', "$dvips",     'do_viewfile', $dvi_final,  $ps_name,   "%Z%R", 1 ],
@@ -3576,10 +3633,7 @@
     fprint8 $aux_file, "\\gdef \\\@abspage\@last{1}\n";
     close($aux_file);
 
-    if (!$silent) { print "After making new aux file, require run of *latex.\n"; }
     foreach my $rule (keys %possible_primaries ) { 
-        rdb_ensure_file( $rule, $texfile_name );
-        rdb_ensure_file( $rule, $aux_main );
         rdb_one_rule(  $rule,  
                        sub{ $$Pout_of_date = 1; }
                     );
@@ -4235,9 +4289,17 @@
     }
     push @rc_files_read, $rc_file;
 
-    # I could use the do command of perl, but the preceeding -r test
-    # to get good diagnostics gets the wrong result under cygwin
-    # (e.g., on /cygdrive/c/latexmk/LatexMk)
+    # I could use the do function of perl, but:
+    # 1. The preceeding -r test (in an earlier version of latexmk) to get
+    #    good diagnostics gets the wrong result under cygwin (e.g., on
+    #    /cygdrive/c/latexmk/LatexMk).  I forget now (Nov. 2022) what the
+    #    problem was exactly.
+    # 2. The do function searches directories in @INC, which is not wanted
+    #    here, where the aim is to execute code in a specific file in a
+    #    specific directory.  In addition, '.' isn't in the default @INC in
+    #    current versions of Perl (Nov. 2022), so "do latexmkrc;" for
+    #    latexmkrc in cwd fails.
+    # So I'll read the rc file and eval its contents.
     if ( !-e $rc_file ) {
         warn "$My_name: The rc-file '$rc_file' does not exist\n";
         return 1;
@@ -4252,6 +4314,12 @@
         # Read all contents of file into $code:
         { local $/ = undef; $code = <$RCH>;}
         close $RCH;
+        if (! is_valid_utf8($code) ) {
+            die "$My_name: Rc-file '$rc_file' is not in UTF-8 coding. You should save\n",
+                "   it in UTF-8 coding for use with current latexmk.\n";
+        }
+        my $BOM = Encode::encode( 'UTF-8', "\N{U+FEFF}" );
+        $code =~ s/^$BOM//;
         eval $code;
     }
     else {
@@ -4653,8 +4721,8 @@
 #**************************************************
 
 sub check_biber_log {
-    # Check for biber warnings:
-    # Usage: check_biber_log( base_of_biber_run, \@biber_source )
+    # Check for biber warnings, and report source files.
+    # Usage: check_biber_log( base_of_biber_run, \@biber_datasource )
     # return 0: OK;
     #        1: biber warnings;
     #        2: biber errors;
@@ -4664,12 +4732,11 @@
     #        6: missing file, one of which is control file
     #       10: only error is missing \citation commands.
     #       11: Malformed bcf file (normally due to error in pdflatex run)
-    # Side effect: add source files @biber_source
-    # N.B. @biber_source is already initialized by caller to contain
-    #   whatever source files (currently .bcf) it already knows about.
+    # Side effect: add source files @biber_datasource
+    # N.B. @biber_datasource is already initialized by caller.
     #   So do **not** initialize it here.
     my $base = $_[0];
-    my $Pbiber_source = $_[1];
+    my $Pbiber_datasource = $_[1];
     my $blg_name = "$base.blg";
     open( my $blg_file, "<", $blg_name )
       or return 3;
@@ -4747,7 +4814,7 @@
                 # copy of a remote file).
                 # So I have included a condition above that the file must
                 # exist to be included in the source-file list.
-                push @$Pbiber_source, $file;
+                push @$Pbiber_datasource, $file;
             }
         }
         elsif ( /> INFO - WARNINGS: ([\d]+)\s*$/ ) {
@@ -4758,14 +4825,14 @@
         }
     }
     close $blg_file;
-    @$Pbiber_source = uniqs( @$Pbiber_source );
+    @$Pbiber_datasource = uniqs( @$Pbiber_datasource );
     @not_found = uniqs( @not_found );
-    push @$Pbiber_source, @not_found;
+    push @$Pbiber_datasource, @not_found;
 
     if ($control_file_malformed){return 11;} 
 
-    if ( ($#not_found < 0) && ($#$Pbiber_source >= 0) ) {
-        print "$My_name: Found biber source file(s) [@$Pbiber_source]\n"
+    if ( ($#not_found < 0) && ($#$Pbiber_datasource >= 0) ) {
+        print "$My_name: Found biber source file(s) [@$Pbiber_datasource]\n"
         unless $silent;
     }
     elsif ( ($#not_found == 0) && ($not_found[0] =~ /\.bib$/) ) {
@@ -4988,7 +5055,14 @@
     # Note: Only MiKTeX allows out_dir ne aux_dir. It puts
     #       .fls file in out_dir, not aux_dir, which seems
     #       not natural.
-    $fls_name = "%Z%R.fls";
+    if ($fls_uses_out_dir) {
+        $fls_name = "%Z%R.fls";
+        $fls_name_alt = "%Y%R.fls";
+    }
+    else {
+        $fls_name = "%Y%R.fls";
+        $fls_name_alt = "%Z%R.fls";
+    }
     $dvi_name  = "%Z%R.dvi";
     $dviF_name = "%Z%R.dviF";
     $ps_name   = "%Z%R.ps";
@@ -5000,7 +5074,7 @@
     ## puts .xdv file in aux_dir.  So we must use %Y not %Z:
     $xdv_name   = "%Y%R.xdv";
 
-    foreach ( $aux_main, $log_name, $fdb_name, $fls_name,
+    foreach ( $aux_main, $log_name, $fdb_name, $fls_name, $fls_name_alt,
               $dvi_name, $ps_name, $pdf_name, $xdv_name, $dviF_name, $psF_name ) {
         s/%R/$root_filename/g;
         s/%Y/$aux_dir1/;
@@ -5022,25 +5096,165 @@
 
 #**************************************************
 
-sub move_out_files_from_aux {
-    # Move output and fls files to out_dir
-    # Omit 'xdv', that goes to aux_dir (as with MiKTeX). It's not final output.
-    foreach my $ext ( 'fls', 'dvi', 'pdf', 'ps', 'synctex', 'synctex.gz' ) {
-        # Include fls file, because MiKTeX puts it in out_dir, rather than
-        # aux_dir, which would seem more natural.  We must maintain
-        # compatibility.
-        my $from =  "$aux_dir1$root_filename.$ext";
-        my $to = "$out_dir1$root_filename.$ext" ;
-        if ( test_gen_file( $from ) ) {
-            if (! $silent) { print "$My_name: Moving '$from' to '$to'\n"; }
-            my $ret = move( $from, $to );
-            if ( ! $ret ) { die "  That failed, with message '$!'\n";}
+sub correct_aux_out_files {
+    # Deal with situations after a *latex run where files are in different
+    # directories than expected (specifically aux v. output directory).
+    # Do minimal fix ups to allow latexmk to analyze dependencies with log
+    # and fls files in expected places
+    if ( $emulate_aux && ($aux_dir ne $out_dir) ) {
+        # Move output and fls files to out_dir
+        # Omit 'xdv', that goes to aux_dir (as with MiKTeX). It's not final output.
+        foreach my $ext ( 'fls', 'dvi', 'pdf', 'ps', 'synctex', 'synctex.gz' ) {
+            if ( ($ext eq 'fls') && ! $fls_uses_out_dir ) {next;}
+            my $from =  "$aux_dir1$root_filename.$ext";
+            my $to = "$out_dir1$root_filename.$ext" ;
+            if ( test_gen_file( $from ) ) {
+                if (! $silent) { print "$My_name: Moving '$from' to '$to'\n"; }
+                my $ret = move( $from, $to );
+                if ( ! $ret ) { die "  That failed, with message '$!'\n";}
+            }
         }
     }
-}
 
-#***************************************************
+    # Deal with log file in unexpected place (e.g., lack of support by *latex
+    # of -aux-directory option.
+    &find_set_log;
 
+    # Fix ups on fls file:
+    if ($recorder) {
+        # Deal with following special cases:
+        #   1. Some implemenations of *latex give fls files of name latex.fls
+        #      or pdflatex.fls instead of $root_filename.fls.
+        #   2. In some implementations, the writing of the fls file (memory
+        #      of old implementations) may not respect the -output-directory
+        #      and -aux-directory options.
+        #   3. Implementations don't agree on which directory (aux or output)
+        #      the fls is written to.  (E.g., MiKTeX changed its behavior in
+        #      Oct 2020.)
+        #   4. Some implementations (TeXLive) don't use -aux-directory.
+        # Situation on implementations, when $emulate_aux is off:
+        #   TeXLive: implements -output-directory only, and gives a non-fatal
+        #      warning for -aux-directory. Symptoms:
+        #         .log, .fls, .aux files written to intended output directory.
+        #         .log file reports TeXLive implementation
+        #     Correct reaction: Turn $emulate_aux on and rerun *latex.  The
+        #         variety of files that can be written by packages is too
+        #         wide to allow simple prescription of a fix up.
+        #  MiKTeX: Pre-Oct-2020: fls file written to out dir.
+        #          Post-Oct-2020: fls file written to aux dir.
+        #  Other names:
+        #  Some older versions wrote pdflatex.fls or latex.fls
+        #  Current TeXLive: the fls file is initially written with the name
+        #    <program name><process number>.fls, and then changed to the
+        #   correct name.  Under some error conditions, the change of name
+        #   does not happen.
+
+        my $std_fls_file = $fls_name;
+        my @other_fls_names = ( );
+        if ( $rule =~ /^pdflatex/ ) {
+            push @other_fls_names, "pdflatex.fls";
+        }
+        else {
+            push @other_fls_names, "latex.fls";
+        }
+        if ( $aux_dir1 ne '' ) {
+            push @other_fls_names, "$root_filename.fls";
+            # The fls file may be in the opposite directory to the
+            # one configured by $fls_uses_out_dir:
+            push @other_fls_names, $fls_name_alt;
+        }
+        # Find the first non-standard fls file and copy it to the standard
+        # place. But only do this if the file time is compatible with being
+        # generated in the current run, and if the standard fls file hasn't
+        # been made in the current run,  as tested by the use of
+        # test_gen_file; that avoids problems with fls files left over from
+        # earlier runs with other versions of latex.
+        if ( ! test_gen_file( $std_fls_file ) ) {
+            foreach my $cand (@other_fls_names) {
+                if ( test_gen_file( $cand ) ) {
+                    print "$My_name: Copying '$cand' to '$std_fls_file'.\n";
+                    copy $cand, $std_fls_file;
+                    last;
+                }
+            }
+        }
+        if ( ! test_gen_file( $std_fls_file ) ) {
+            warn "$My_name: fls file doesn't appear to have been made.\n";
+        }
+    }
+} # END correct_aux_out_files
+
+#-----------------
+
+sub find_set_log {
+    # Locate the log file, generated on this run.
+    # It should be in aux_dir. But:
+    #  1. With a sufficiently severe error in *latex, no log file was generated.
+    #  2. With aux_dir ne out_dir and emulate_aux off and a (TeXLive) *latex
+    #     that doesn't support aux_dir, the log file is in out_dir.
+    #  3. If the specified command has no %O or if *latex doesn't support
+    #     out_dir (hence not TeXLive and not MiKTeX), the log file would
+    #     be in cwd.
+    #
+    #  3 is fatal error.
+    #  2 is handled by turning emulate_aux on, after which next run of *latex
+    #    handles problem.
+    #  1 is like any other error.
+    #  4 is treated like 1 (log file not found).
+    #
+    # Returns 
+    #    0 log file not found;
+    #    1 log file in aux_dir i.e., correct place;
+    #    2 log file **not** in aux_dir but in out_dir,
+    #      emulate_aux turned on, commands fixed,
+    #      and log file copied to aux_dir
+    # If the log file is found in cwd, report it and give fatal error.
+    
+    my $where_log = -1; # Nothing analyzed yet
+
+    if ( test_gen_file( "$aux_dir1$root_filename.log" ) ) {
+        # .log file is in expected place.
+        $where_log = 1;
+    }
+    elsif ( (! $emulate_aux) && test_gen_file( "$out_dir1$root_filename.log" ) ) {
+        warn "$My_name: .log file in '$out_dir' instead of expected '$aux_dir'\n",
+             "   But emulate_aux is off.  So I'll turn it on.\n",
+             "   I'll copy the log file to the correct place.\n",
+             "   The next run of *latex **SHOULD** not have this problem.\n";
+        copy( "$out_dir1$root_filename.log", "$aux_dir1$root_filename.log" );
+        $where_log = 2;
+        $emulate_aux = 1;
+        $emulate_aux_switched = 1;
+        # Fix up commands to have fudged use of directories for
+        # use with non-aux-dir-supported *latex engines.
+        foreach ( $$Pext_cmd ) {
+            s/ -output-directory=[^ ]*(?= )//g;
+            s/ -aux(-directory=[^ ]*)(?= )/ -output$1/g;
+        }
+    }
+    elsif ( test_gen_file( "$root_filename.log" ) ) {
+        # .log file is not in out_dir nor in aux_dir, but is in cwd.
+        # Presumably there is a configuration error
+        # that prevents the directories from being used by latex.
+        die "$My_name: The log file found was '$root_filename.log' instead of\n",
+            "  '$aux_dir1$root_filename.log'.  Probably a configuration error\n",
+            "  prevented the use of the -aux-directory and/or the -output-directory\n",
+            "  options with the *latex command.\n",
+            "  I'll stop.\n";
+    }
+    else {
+        # No .log file found
+        $failure = 1;
+        $$Plast_result = 2;
+        $where_log = 0;
+        $failure_msg 
+            = "*LaTeX didn't generate the expected log file '$log_name'\n";
+    }
+    return $where_log;
+} #END find_set_log
+
+#************************************************************
+
 sub parse_log {
 # Use: parse_log( log_file_name,
 #                 ref to array containing lines,
@@ -5872,75 +6086,6 @@
 
 #=====================================
 
-sub find_set_log {
-    # Locate the log file, generated on this run.
-    # It should be in aux_dir. But:
-    #  1. With a sufficiently severe error in *latex, no log file was generated.
-    #  2. With aux_dir ne out_dir and emulate_aux off and a (TeXLive) *latex
-    #     that doesn't support aux_dir, the log file is in out_dir.
-    #  3. If the specified command has no %O or if *latex doesn't support
-    #     out_dir (hence not TeXLive and not MiKTeX), the log file would
-    #     be in cwd.
-    #
-    #  3 is fatal error.
-    #  2 is handled by turning emulate_aux on, after which next run of *latex
-    #    handles problem.
-    #  1 is like any other error.
-    #  4 is treated like 1 (log file not found).
-    #
-    # Returns 
-    #    0 log file not found;
-    #    1 log file in aux_dir i.e., correct place;
-    #    2 log file **not** in aux_dir but in out_dir,
-    #      emulate_aux turned on, commands fixed,
-    #      and log file copied to aux_dir
-    # If the log file is found in cwd, report it and give fatal error.
-    
-    my $where_log = -1; # Nothing analyzed yet
-
-    if ( test_gen_file( "$aux_dir1$root_filename.log" ) ) {
-        # .log file is in expected place.
-        $where_log = 1;
-    }
-    elsif ( (! $emulate_aux) && test_gen_file( "$out_dir1$root_filename.log" ) ) {
-        warn "$My_name: .log file in '$out_dir' instead of expected '$aux_dir'\n",
-             "   But emulate_aux is off.  So I'll turn it on.\n",
-             "   I'll copy the log file to the correct place.\n",
-             "   The next run of *latex **SHOULD** not have this problem.\n";
-        copy( "$out_dir1$root_filename.log", "$aux_dir1$root_filename.log" );
-        $where_log = 2;
-        $emulate_aux = 1;
-        $emulate_aux_switched = 1;
-        # Fix up commands to have fudged use of directories for
-        # use with non-aux-dir-supported *latex engines.
-        foreach ( $$Pext_cmd ) {
-            s/ -output-directory=[^ ]*(?= )//g;
-            s/ -aux(-directory=[^ ]*)(?= )/ -output$1/g;
-        }
-    }
-    elsif ( test_gen_file( "$root_filename.log" ) ) {
-        # .log file is not in out_dir nor in aux_dir, but is in cwd.
-        # Presumably there is a configuration error
-        # that prevents the directories from being used by latex.
-        die "$My_name: The log file found was '$root_filename.log' instead of\n",
-            "  '$aux_dir1$root_filename.log'.  Probably a configuration error\n",
-            "  prevented the use of the -aux-directory and/or the -output-directory\n",
-            "  options with the *latex command.\n",
-            "  I'll stop.\n";
-    }
-    else {
-        # No .log file found
-        $failure = 1;
-        $$Plast_result = 2;
-        $where_log = 0;
-        $failure_msg 
-            = "*LaTeX didn't generate the expected log file '$log_name'\n";
-    }
-    return $where_log;
-} #END find_set_log
-
-#************************************************************
-
 sub parse_fls {
     my $start_time = processing_time();  
     my ($fls_name, $Pinputs, $Poutputs, $Pfirst_read_after_write, $Ppwd_latex ) = @_;
@@ -6044,31 +6189,44 @@
             if ( (exists $$Poutputs{$file}) && (! exists $$Pinputs{$file}) ) {
                 $$Pfirst_read_after_write{$file} = 1;
             }
-            # Take precautions against main destination file being listed as INPUT file
-            # This results, e.g., from hyperxmp (2020/10/05 v. 5.6) reading the pdf file
-            # size, and triggers an infinite loop, unless we omit the pdf file from the 
-            # list of input files.  (Hyperxmp v. 5.7 2010/11/01 doesn't give this problem.)
-            # There's a related issue with the log file, when acmart.cls is used with
-            # xelatex.  (I don't work out what causes this, e.g., what package.)
-            # Test on basenames rather than full name to evade in a simple-minded way
-            # alias issues with the directory part.
+            # Take precautions when the main destination file (or pdf file) or the log
+            # file are listed as INPUT files in the .fls file.
+            # At present, the known cases are caused by hyperxmp, which reads file metadata
+            # for certain purposes (e.g., setting a current date and time, or finding the
+            # pdf file size).  These uses are legitimate, but the files should not be
+            # treated as genuine source files for *latex.
+            # Note that both the pdf and log files have in their contents strings for
+            # time and date, so in general their contents don't stabilize between runs
+            # of *latex.  Hence adding them to the list of source files on the basis of
+            # their appearance in the list of input files in the .fls file would cause
+            # an incorrect infinite loop in the reruns of *latex.
+            #
+            # Older versions of hyperxmp (e.g., 2020/10/05 v. 5.6) reported the pdf file
+            # as an input file.
+            # The current version when used with xelatex reports the .log file as an
+            # input file. 
+            #
+            # The test for finding the relevant .pdf (or .dvi ...) and .log files is
+            # on basenames rather than full name to evade in a simple-minded way
+            # alias issues with the directory part:
             if ( basename($file) eq $pdf_base ) {
                 warn "$My_name: !!!!!!!!!!! Fls file lists main pdf **output** file as an input\n",
-                     "   file for rule '$rule'. I won't treat as a source file, since that leads\n",
-                     "   to an infinite loop.\n",
-                    "    This can be caused by the hyperxmp package in an old version.\n",
-                    "    You should update to hyperxmp in ver. 5.7 or higher\n";
+                     "   file for rule '$rule'. I won't treat as a source file, since that can\n",
+                     "   lead to an infinite loop.\n",
+                     "   This situation can be caused by the hyperxmp package in an old version,\n",
+                     "   in which case you can ignore this message.\n";
             } elsif ( basename($file) eq $out_base ) {
                 warn "$My_name: !!!!!!!!!!! Fls file lists main **output** file as an input\n",
-                     "   file for rule '$rule'. I won't treat as a source file, since that leads\n",
-                     "   to an infinite loop.\n",
-                    "    This can be caused by the hyperxmp package in an old version.\n",
-                    "    You should update to hyperxmp in ver. 5.7 or higher\n";
+                     "   file for rule '$rule'. I won't treat as a source file, since that can\n",
+                     "   lead to an infinite loop.\n",
+                     "   This situation can be caused by the hyperxmp package in an old version,\n",
+                     "   in which case you can ignore this message.\n";
             } elsif ( basename($file) eq $log_base ) {
-                warn "$My_name: !!!!!!!!!!! Fls file lists log file as an input\n",
-                     "   file for rule '$rule'. I won't treat it as a source file, since\n",
-                    "   there appear to be no good uses for it.\n",
-                    "   This behavior happens at least under acmart.cls with xelatex\n";
+                warn "$My_name: !!!!!!!!!!! Fls file lists log file as an input file for\n",
+                     "   rule '$rule'. I won't treat it as a source file.\n",
+                     "   This situation can occur when the hyperxmp package is used with\n",
+                     "   xelatex; the package reads the .log file's metadata to set current\n",
+                     "   date and time.  In this case you can safely ignore this message.\n";
             } else {
                 $$Pinputs{$file} = 1;
             }
@@ -6298,15 +6456,15 @@
     return 1;
 } #END parse_aux
 
-
-
 #************************************************************
 
 sub parse_aux1
 # Parse single aux file for bib files.  
 # Usage: &parse_aux1( aux_file_name )
-#   Append newly found bib_filenames in @$Pbib_files, already 
+#   Append newly found names of .bib files to %bib_files, already
 #        initialized/in use.
+#   Append newly found names of .bst files to %bst_files, already
+#        initialized/in use.
 #   Append aux_file_name to @$Paux_files if aux file opened
 #   Recursively check \@input aux files
 #   Return 1 if success in opening $aux_file_name and parsing it
@@ -6365,6 +6523,70 @@
 
 #************************************************************
 
+sub parse_bcf {
+    # Parse bcf file for bib and other source files.  
+    # Usage: parse_bcf( $bcf_file, \@new_bib_files )
+    # If can't open bcf file, then
+    #    Return 0 and leave @new_bib_files empty
+    # Else set @new_bib_files from information in the
+    #       bcf files 
+    #    And:
+    #    Return 1 if no problems
+    #    Return 2 with @new_bib_files empty if there are no relevant source
+    #      file lines.
+    #    Return 3 if I couldn't locate all the bib_files
+    # A full parse of .bcf file as XML would need an XML parsing module, which
+    # is not in a default installation of Perl, notably in TeXLive's perl for
+    # Win32 platform.  To avoid requiring the installation, just search the
+    # .bcf file for the relevant lines.
+
+    my $bcf_file = $_[0];
+    my $Pbib_files = $_[1];
+    # Default return value
+    @$Pbib_files = ();
+    # Map file specs (from datasource lines) to actual filenames:
+    local %bib_files = ();
+    my @not_found_bib = ();
+
+    open(my $bcf_fh, $bcf_file)
+    || do {
+       warn "$My_name: Couldn't find bcf file '$bcf_file'\n";
+       return 0; 
+    };
+    while ( <$bcf_fh> ) {
+        $_ = utf8_to_mine($_);
+        if ( /^\s*<bcf:datasource type=\"file\"\s+datatype=\"bibtex\"\s+glob=\"false\">(.+)<\/bcf:datasource>/ ) {
+            $bib_files{$1} = '';
+        }
+    }
+    close $bcf_fh;
+
+    find_files( \%bib_files, 'bib', 'bib', $Pbib_files, \@not_found_bib );
+    if ( $#{$Pbib_files} == -1 ) {
+        # 
+        print "$My_name: No .bib files listed in .bcf file '$bcf_file'\n";
+        return 2;
+    }
+
+    show_array( "$My_name: Bibliography file(s) form .bcf file:", @$Pbib_files )
+        unless $silent;
+    if (@not_found_bib) {
+        show_array(
+            "Bib file(s) not found in search path:",
+            @not_found_bib );
+    }
+    if (@not_found_bib) {
+        if ($force_mode) {
+            warn "$My_name: Failed to find one or more bibliography files in search path.\n";
+            warn "====BUT force_mode is on, so I will continue. There may be problems ===\n";
+        }
+        return 3;
+    }
+    return 1;
+
+} #END parse_bcf
+
+
 #************************************************************
 #************************************************************
 #************************************************************
@@ -7204,33 +7426,35 @@
         my @new_bib_files = ();
         my @new_aux_files = ();
         my @new_bst_files = ();
-        my @biber_source = ( "$bbl_base.bcf" );
+        my $bcf_file =  "$bbl_base.bcf";
         my $bib_program = 'bibtex';
-        if ( test_gen_file( "$bbl_base.bcf" ) ) {
-             $bib_program = 'biber';
+        if ( test_gen_file( $bcf_file ) ) {
+            $bib_program = 'biber';
         }
         my $from_rule = "$bib_program $bbl_base";
         print "=======  Dealing with '$from_rule'\n" if ($diagnostics);
         # Don't change to use activation and deactivation here, rather than
         # creation and removal of rules.  This is because rules are to be
-        # created on the fly here with details corresponding to current. So
-        # activating a previously inactive rule, which is out-of-date, may
-        # cause trouble.
+        # created on the fly here with details corresponding to current state
+        # of .tex source file(s). So activating a previously inactive rule,
+        # which is out-of-date, may cause trouble.
         if ($bib_program eq 'biber') {
-            check_biber_log( $bbl_base, \@biber_source );
             # Remove OPPOSITE kind of bbl generation:
             rdb_remove_rule( "bibtex $bbl_base" );
+
+            parse_bcf( $bcf_file, \@new_bib_files );
         }
         else {
-            parse_aux( "$bbl_base.aux", \@new_bib_files, \@new_aux_files, \@new_bst_files );
             # Remove OPPOSITE kind of bbl generation:
             rdb_remove_rule( "biber $bbl_base" );
+            
+            parse_aux( "$bbl_base.aux", \@new_bib_files, \@new_aux_files, \@new_bst_files );
         }
         if ( ! rdb_rule_exists( $from_rule ) ){
             print "   ===Creating rule '$from_rule'\n" if ($diagnostics);
             if ( $bib_program eq 'biber' ) {
                 rdb_create_rule( $from_rule, 'external', $biber, '', 1,
-                                 "$bbl_base.bcf", $bbl_file, $bbl_base, 1, 0, 0, 1, [ "$bbl_base.blg" ]  );
+                                 $bcf_file, $bbl_file, $bbl_base, 1, 0, 0, 1, [ "$bbl_base.blg" ]  );
             }
             else {
                 rdb_create_rule( $from_rule, 'external', $bibtex, 'run_bibtex', 1,
@@ -7242,7 +7466,7 @@
         rdb_one_rule( $from_rule, sub { %old_sources = %$PHsource; } );
         my @new_sources = ( @new_bib_files, @new_aux_files, @new_bst_files );
         if ( $bib_program eq 'biber' ) {
-            push @new_sources, @biber_source;
+            push @new_sources, $bcf_file;
         }
         foreach my $source ( @new_sources ) {
             print "  ===Source file '$source' for '$from_rule'\n"
@@ -7468,10 +7692,12 @@
     #    and for those TeX engines (not MiKTeX) that put \openout lines in log
     #    file.
     # b. By the file existing and being at least as new as the system
-    #    time at the start of the run. 
+    #    time at the start of the run.  But make an allowance ($filetime_slop) for
+    #    differences in granularity between reported system time and reported
+    #    file mtimes.
     my $file = shift;
     return exists $generated_log{$file} || $generated_fls{$file}
-           || ( -e $file && ( get_mtime( $file ) >= $$Prun_time));
+           || ( -e $file && ( get_mtime( $file ) >= $$Prun_time - $filetime_slop ));
 }
 
 #************************************************************
@@ -8393,16 +8619,12 @@
         if ($bibtex_use == 0) {
            $bibtex_not_run = 2;
         }
-        else {
-            if ( $rule =~ /^biber/ ) {
-                warn "$My_name: ???!!!==== Using biber OMITTING TEST on missing bib files\n";
-            }
-            elsif ( ($bibtex_use == 1) || ($bibtex_use == 1.5) ) {
-                foreach ( keys %$PHsource ) {
-                    if ( ( /\.bib$/ ) && (! -e $_) ) {
-                        push @missing_bib_files, $_;
-                        $bibtex_not_run = 1;
-                    }
+        elsif ( ($bibtex_use == 1) || ($bibtex_use == 1.5) ) {
+            # Conditional run of bibtex (or biber) depending on existence of .bib file.
+            foreach ( keys %$PHsource ) {
+                if ( ( /\.bib$/ ) && (! -e $_) ) {
+                    push @missing_bib_files, $_;
+                    $bibtex_not_run = 1;
                 }
             }
         }
@@ -8579,7 +8801,7 @@
 
     if ($latex_like) { run_hooks( 'before_xlatex' ); }
 
-    my $time = processing_time();
+    my $time_start = processing_time();
    
     if ($int_cmd) {
         print "For rule '$rule', use internal command '\&$int_cmd( @int_args_for_printing )' ...\n"
@@ -8597,8 +8819,7 @@
         $$Plast_result = 2;
         $$Plast_message = "Bug or configuration error; incorrect command type";
     }
-    $time = processing_time() - $time;
-    add_timing( $time, $rule );
+    add_timing( processing_time() - $time_start, $rule );
 
 #============================================================================
 
@@ -8611,17 +8832,15 @@
     #
     $$Pout_of_date = $$Pout_of_date_user = 0;
     if ($latex_like) {
-        if ( $emulate_aux && ($aux_dir ne $out_dir) ) {
-            &move_out_files_from_aux;
-        }
+        &correct_aux_out_files;
         run_hooks( 'after_xlatex' );
         $return = analyze_latex_run( $return );
         run_hooks( 'after_xlatex_analysis' );
     }
     elsif ( $rule =~ /^biber/ ) {
-        my @biber_source = ( );
-        my $retcode = check_biber_log( $$Pbase, \@biber_source );
-        foreach my $source ( @biber_source ) {
+        my @biber_datasource = ( );
+        my $retcode = check_biber_log( $$Pbase, \@biber_datasource );
+        foreach my $source ( @biber_datasource ) {
 #           if ( $source =~ /\"/ ) {next; }
             print "  ===Source file '$source' for '$rule'\n"
                if ($diagnostics);
@@ -8681,16 +8900,6 @@
             unlink $$Pdest;
             # The missing bbl file is now not an error:
             $return = -2;
-# ??????? BCF
-# Following is intended to work, but creates infinite loop
-# in malformed bcf file situation under -pvc.
-# since on each check for change in ANY file, pvc finds changed file
-# Need to restrict pvc reruns to case of changed USER files
-#           # To give good properties for *latex rule, it is best
-#           # to have a valid bbl file that exists:
-#           create_empty_file( $$Pdest );
-#            $return = 0;
-            
         }
     }
     elsif ( $rule =~ /^bibtex/ ) {
@@ -8860,8 +9069,6 @@
     return $return;
 } #END Run_subst
 
-#-----------------
-
 sub analyze_latex_run {
     # Call: analyze_latex_run(old_ret_code)
     # Analyze results of run of *latex (or whatever was run instead) from
@@ -8885,56 +9092,12 @@
     # Need to worry about changed directory, changed output extension
     # Where else is $missing_dvi_pdf set?  Was it initialized?
     if (-e $$Pdest) { $missing_dvi_pdf = '';}
-
-    # Handle case that log file is caused to be in an unexpected place,
-    #   from a configuration error:
-    &find_set_log;
     
-    if ($recorder) {
-        # Handle problem that some version of *latex give fls files
-        #    of name latex.fls or pdflatex.fls instead of $root_filename.fls.
-        # Also that setting of -output-directory -aux-directory is not 
-        #    respected by *latex, at least in some versions.
-
-        my $std_fls_file = $fls_name;
-        my @other_fls_names = ( );
-        if ( $rule =~ /^pdflatex/ ) {
-            push @other_fls_names, "pdflatex.fls";
-        }
-        else {
-            push @other_fls_names, "latex.fls";
-        }
-        if ( $aux_dir1 ne '' ) {
-            push @other_fls_names, "$root_filename.fls";
-            # MiKTeX uses out_dir for .fls. However, it seems logical to
-            # me for .fls to be in aux_dir.  So I'll allow for this
-            # Possibility, although I don't know if it has been used.
-            push @other_fls_names, "$aux_dir1$root_filename.fls";
-        }
-        # Find the first non-standard fls file and copy it to the standard
-        # place. But only do this if the file time is compatible with being
-        # generated in the current run, and if the standard fls file hasn't
-        # been made in the current run,  as tested by the use of
-        # test_gen_file; that avoids problems with fls files leftover from
-        # earlier runs with other versions of latex.
-        if ( ! test_gen_file( $std_fls_file ) ) {
-            foreach my $cand (@other_fls_names) {
-                if ( test_gen_file( $cand ) ) {
-                    copy $cand, $std_fls_file;
-                    last;
-                }
-            }
-        }
-        if ( ! test_gen_file( $std_fls_file ) ) {
-            warn "$My_name: fls file doesn't appear to have been made.\n";
-        }
-    }
-
     # Find current set of source files:
     my ($missing_dirs, $PA_missing_subdirs, $bad_warnings) = &rdb_set_latex_deps;
     if ($bad_warning_is_error && $bad_warnings) {
         warn "$My_name: Serious warnings in .log configured to be errors\n";
-        $return ||= $bad_warnings;
+        $return ||= $bad_warnings;1
     }
 
     # For each file of the kind made by epstopdf.sty during a run, 
@@ -9303,46 +9466,7 @@
 
 #************************************************************
 
-#sub rdb_diagnose_changes {
-#    # ???!!! delete after using ideas in rdb_diagnose_changes2
-#    # Call: rdb_diagnose_changes or rdb_diagnose_changes( heading, show_out_of_date_rules )
-#    # Precede the message by the optional heading, else by "$My_name: " 
-#    my ($heading, $show_out_of_date_rules) = @_;
-#    our ( @changed, %changed_rules, @disappeared, @no_dest, @rules_to_apply,
-#          @rules_never_run );
-#    
-#    if ($#rules_never_run >= 0) {
-#        show_array( "${heading}Rules & subrules not known to be previously run:", @rules_never_run );
-#    }
-#    if ( ($#changed >= 0) || (keys %changed_rules > 0) || ($#disappeared >= 0) || ($#no_dest >= 0) ) {
-#        print "${heading}File changes, etc:\n";
-#        if ( $#changed >= 0 ) {
-#            # ???!!! Modify to allow for case of 
-#            show_array( " Changed files, or newly in use/created since previous run(s):", uniqs(@changed) );
-#        }
-#        if ( $#disappeared >= 0 ) {
-#            show_array( " No-longer-existing files:", uniqs(@disappeared) );
-#        }
-#        if ( $#no_dest >= 0 ) {
-#            show_array( " Non-existent destination for:", uniqs(@no_dest) );
-#        }
-#        if ( keys %changed_rules > 0 ) {
-#            print "  Rule(s) that have been run and require run of dependent rule:\n";
-#            while (my ($s_rule, $d_rule) = each %changed_rules) {
-#                print "      '$s_rule' which requires run of '$d_rule'\n";
-#            }
-#        }
-#    }
-#    if ($show_out_of_date_rules) {
-#        show_array( "${heading}Overall, the following rules became out-of-date:",
-#                    uniqs(@rules_to_apply));
-#    }
-#}  #END rdb_diagnose_changes
-
-#----------------------------
-
 sub rdb_diagnose_changes2 {
-    # ???!!! Examine rdb_diagnose_changes for ideas in old version to use here.
     # Call: rdb_diagnose_changes2( \%changes, heading, show_out_of_date_rules )
 
     my ($PHchanges, $heading, $show_out_of_date_rules) = @_;
@@ -9710,31 +9834,35 @@
     # rdb_create_rule( rule, command_type, ext_cmd, int_cmd, DUMMY,
     #                  source, dest, base, 
     #                  needs_making, run_time, check_time, set_file_not_exists,
-    #                  ref_to_array_of_specs_of_extra_generated_files )
+    #                  ref_to_array_of_specs_of_extra_generated_files,
+    #                  ref_to_array_of_specs_of_extra_source_files )
     # int_cmd is either a string naming a perl subroutine or it is a
     # reference to an array containing the subroutine name and its
     # arguments. 
     # Makes rule.  Update rule if it already exists.
-    # Omitted arguments: replaced by 0 or '' as needed.
+    # Omitted arguments: replaced by 0, '', or [] as needed.
     # Rule is made active
 # ==== Sets rule data ====
     my ( $rule, $cmd_type, $ext_cmd, $PAint_cmd, $DUMMY, 
          $source, $dest, $base, 
          $needs_making, $run_time, $check_time, $set_file_not_exists,
-         $extra_gen ) = @_;
+         $PAextra_gen, $PAextra_source ) = @_;
+    # Set defaults for undefined arguments
     foreach ( $needs_making, $run_time, $check_time, $DUMMY ) {
         if (! defined $_) { $_ = 0; }
     }
+    foreach ( $cmd_type, $ext_cmd, $PAint_cmd, $source, $dest, $base, 
+              $set_file_not_exists ) {
+        if (! defined $_) { $_ = ''; }
+    }
+    foreach ( $PAextra_gen, $PAextra_source ) {
+        if (! defined $_) { $_ = []; }
+    }
     my $last_result = -1;
     my $no_history = ($run_time <= 0);
     my $active = 1;
     my $changed = 0;
 
-    # Set defaults, and normalize parameters:
-    foreach ( $cmd_type, $ext_cmd, $PAint_cmd, $source, $dest, $base, 
-              $set_file_not_exists ) {
-        if (! defined $_) { $_ = ''; }
-    }
     if ( ($source =~ /\"/) || ($dest =~ /\"/) || ($base =~ /\"/) ) {
         die "$My_name: Error. In rdb_create_rule to create rule\n",
             "    '$rule',\n",
@@ -9752,22 +9880,18 @@
         # COPY the referenced array:
         $PAint_cmd = [ @$PAint_cmd ];
     }
-    my $PA_extra_gen = [];
-    if ($extra_gen) {
-        @$PA_extra_gen = @$extra_gen;
-    }
     $rule_db{$rule} = 
         [  [$cmd_type, $ext_cmd, $PAint_cmd, $no_history, 
             $source, $dest, $base,
             $needs_making, 0, $run_time, $check_time, $changed,
-            $last_result, '', $PA_extra_gen ],
+            $last_result, '', $PAextra_gen ],
            {},
            {},
            {},
            {}
         ];
-    if ($source) {
-       rdb_ensure_file( $rule, $source, undef, $set_file_not_exists );  
+    foreach my $file ($source, @$PAextra_source ) {
+        if ($file) { rdb_ensure_file( $rule, $file, undef, $set_file_not_exists ); }
     }
     rdb_one_rule( $rule, \&rdb_initialize_generated );
     if ($active) { rdb_activate($rule); }
@@ -9831,10 +9955,13 @@
     #    (a) by default initialize it to current file state.
     #    (b) but if the fourth argument, set_not_exists, is true, 
     #        initialize the item as if the file does not exist.
-    #        This case is typically used when the log file for a run
-    #        of latex/pdflatex claims that the file was non-existent
-    #        at the beginning of a run. 
-#============ rule and file data set here ======================================
+    #        This case is typically used
+    #         (1) when the log file for a run of latex/pdflatex claims
+    #             that the file was non-existent at the beginning of a
+    #             run.
+    #         (2) When initializing rules, when there is no previous
+    #             known run under the control of latexmk.
+#============ NOTE: rule and file data set here ===============================
     my $rule = shift;
     local ( $new_file, $new_from_rule, $set_not_exists ) = @_;
     if ( ! rdb_rule_exists( $rule ) ) {
@@ -10290,9 +10417,18 @@
 
 #************************************************************
 
-sub processing_time
-{  my ($user, $system, $cuser, $csystem) = times();
-   return $user + $system + $cuser + $csystem;
+sub processing_time {
+    # Return time used.
+    # Either total processing time of process and child processes as reported
+    # in pieces by times(), or HiRes time since Epoch depending on setting of
+    # $times_are_clock.
+    # That variable is to be set on OSs (MSWin32) where times() does not
+    # include time for subprocesses.
+    if ($times_are_clock) {
+        return Time::HiRes::time();
+    }
+    my ($user, $system, $cuser, $csystem) = times();
+    return $user + $system + $cuser + $csystem;
 }
 
 #************************************************************



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