[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
---------------------------+--------------------------------
 Reporter:  macosx12345@…  |      Owner:  macports-tickets@…
     Type:  defect         |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  ports          |    Version:  2.1.2
 Keywords:                 |       Port:  wxMaxima
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 The port wxMaxima requires wxWidgets. The port wxWidgets cannot be
 installed under Mac OS 10.8 (message "`wxWidgets does not build on 10.8
 due to missing Carbon support, please use port wxWidgets30 instead`").
 Even if wxWidgets30 is installed, installation of wxMaxima fails because
 its Portfile requires wxWidgets.

 The attached patch to the Portfile of wxMaxima adds a variant wxWidgets30
 which is automatically added if wxWidgets30 is installed. With it,
 wxMaxima can be installed with:

 {{{port install wxWidgets30 wxMaxima}}}

 Thanks!

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