[MacPorts] #37344: Add a variant to wxMaxima to enable installation under Mac OS 10.8

[MacPorts]

#37344: Add a variant to wxMaxima to enable installation under Mac OS 10.8
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  Reporter:  macosx12345@…  |      Owner:  usami-k@…
      Type:  defect         |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.1.2
Resolution:                 |   Keywords:
      Port:  wxMaxima       |
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Comment (by macsforever2000@…):

 Added in r105900. I also made wxwidgets30 the default and made sure that
 gnuplot is also installed with {{{+wxwidgets30}}} when using that variant.

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Ticket URL: <https://trac.macports.org/ticket/37344#comment:5>
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