[OS X TeX] 1999

[George Gratzer]

I'm trying to typeset a book I wrote in 1999. 

I get an error message:

(/usr/local/texlive/2012/texmf-dist/tex/context/base/supp-pdf.mkii
[Loading MPS to PDF converter (version 2006.09.02).]
/usr/local/texlive/2012/texmf-dist/tex/context/base/supp-pdf.mkii:140: Missing 
endcsname inserted.
<to be read again> 
                   relax 
<inserted text> if
                  done
<argument> ifdone 
                  
@if ...def csname expandafter @gobbletwo string #1
                                                  expandafter @gobbletwo str...

newif ...capechar m at ne let #1iffalse @if #1iftrue 
                                                  @if #1iffalse escapechar c...
l.140 ...pandafter \newif \csname ifdone\endcsname
                                                  
? 

and GoTo Error takes me to supp-pdf.mkii. Was this not present in 1999?

How do I go around  this?

GG
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