[MacPorts] #61757: py38-matplotlib @3.3.3 does not build on PPC Leopard, Mac OS X 10.5.8, because of "cc1obj: error: -Werror=unguarded-availability: No option -Wunguarded-availability"

[MacPorts]

#61757: py38-matplotlib @3.3.3 does not build on PPC Leopard, Mac OS X 10.5.8,
because of "cc1obj: error: -Werror=unguarded-availability: No option
-Wunguarded-availability"
------------------------------+---------------------
  Reporter:  ballapete        |      Owner:  (none)
      Type:  defect           |     Status:  new
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.6.4
Resolution:                   |   Keywords:  leopard
      Port:  py38-matplotlib  |
------------------------------+---------------------

Comment (by kencu):

 looks like you're getting into some more advanced Apple SDK needs, beyond
 what Leopard can offer.

 Simplest solution is usually to toggle that backend off on failing
 systems, if possible.

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Ticket URL: <https://trac.macports.org/ticket/61757#comment:3>
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