[MacPorts] #63962: asymptote @2.70_1 doesn't build on monterey

[MacPorts]

#63962: asymptote @2.70_1 doesn't build on monterey
------------------------+----------------------
  Reporter:  baikel     |      Owner:  mojca
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.7.1
Resolution:             |   Keywords:  monterey
      Port:  asymptote  |
------------------------+----------------------

Comment (by baikel):

 Ugh, I finally managed to compile asymptote. This required to comment out
 the following part of "asymptote.sty" in its doc part:
 {{{
 \IfFileExists{ifxetex.sty}{
   \RequirePackage{ifxetex}
 }{
   \expandafter\newif\csname ifxetex\endcsname
   \ifx\XeTeXversion\@undefined\else
     \xetextrue
   \fi
 }
 }}}
 Dunno what this "ifxetex" is about there…

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Ticket URL: <https://trac.macports.org/ticket/63962#comment:6>
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