[MacPorts] #36348: mesa @8.0.4 -python26 -python27 fails to build when python32 is installed

[MacPorts]

#36348: mesa @8.0.4 -python26 -python27 fails to build when python32 is installed
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  Reporter:  richard.graham@…  |      Owner:  jeremyhu@…
      Type:  defect            |     Status:  new
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:  2.1.2
Resolution:                    |   Keywords:
      Port:  mesa              |
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Comment (by richard.graham@…):

 Replying to [comment:2 jmr@…]:
 > I don't think you're meant to be able to install without one of the
 python variants selected. There isn't an automatic way to indicate "one of
 this group of variants must be set".

 Huh? I thought variants were always optional.

 The problem seems to be that the build script incorrectly assumes that
 `builtins/tools/generate_builtins.py`, a Python 2.x script, will execute
 successfully even if Python 3.x is the only version installed.

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Ticket URL: <https://trac.macports.org/ticket/36348#comment:3>
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