[MacPorts] #36904: grass: add wxPython variant

[MacPorts]

#36904: grass: add wxPython variant
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  Reporter:  drew.mueller@…  |      Owner:  macports-tickets@…
      Type:  enhancement     |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:
Resolution:                  |   Keywords:
      Port:  grass           |
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Comment (by larryv@…):

 Replying to [comment:6 vaccari@…]:
 > I see that people at homebrew apparently solved the issue

 https://github.com/mxcl/homebrew/blob/master/Library/Formula/grass.rb#L147

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Ticket URL: <https://trac.macports.org/ticket/36904#comment:7>
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