[tlbuild] error: unknown type name ‘off64_ t’ in zziplib

[Karl Berry]

Hi Vincent,

    Indeed, the configure script has not been fixed: 

I changed (r68949) the zziplib-specific macro in
  libs/zziplib/m4/ax_prefix_config_h.m4
to use the Autoconf-provided $as_echo (which is printf "%s\n") instead
of plain echo. After that, I could successfully build with
  CONFIG_SHELL=/bin/dash ./Build -g -C

Before, the error was
include/zzip/_config.h:15:14: warning: extra tokens at end of #ifndef directive
 #ifndef ZZIP_^A
(where that is a real CTRL-A character).

Hopefully that will solve it, at least until dash gratuitously breaks
printf "\n". --best, karl.