[MacPorts] #60453: build failure wxMaxima

[MacPorts]

#60453: build failure wxMaxima
-------------------------+--------------------------
  Reporter:  dyne2meter  |      Owner:  MSoegtropIMC
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.2
Resolution:              |   Keywords:
      Port:  wxMaxima    |
-------------------------+--------------------------

Comment (by ryandesign):

 Michael, I guess you used `sudo port select` to select MacPorts gcc9 as
 your compiler. It is a bug that the wxMaxima port is not
 UsingTheRightCompiler, caused by running commands manually in the build
 phase rather than using the infrastructure MacPorts has in the cmake
 portgroups.

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Ticket URL: <https://trac.macports.org/ticket/60453#comment:11>
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