[MacPorts] #65568: py39-pyqt5 fails to build on macOS 11.6.8

[MacPorts]

#65568: py39-pyqt5 fails to build on macOS 11.6.8
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  Reporter:  kgarrels    |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  py39-pyqt5  |
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Comment (by kgarrels):

 Xcode 12.4

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Ticket URL: <https://trac.macports.org/ticket/65568#comment:2>
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