[MacPorts] #62934: Failed to configure qt5-qtbase

[MacPorts]

#62934: Failed to configure qt5-qtbase
-------------------------+---------------------------------
  Reporter:  pcmock      |      Owner:  MarcusCalhoun-Lopez
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.0
Resolution:              |   Keywords:
      Port:  qt5-qtbase  |
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Comment (by gcs-github):

 I ran into the same problem, and ended up working around it by changing
 qt's mkspec file @ qtbase-everywhere-src-5.15.2/mkspecs/common/macx.conf
 so that QMAKE_MAC_SDK = macosx11.3
 (I also set QT_MAC_SDK_VERSION_MAX to 11.3 for good measure, but I don't
 think that had much of an impact).

 Could a suggestion for a fix be to dynamically patch the mkspecs file or
 otherwise override it so that QMAKE_MAC_SDK is set to
 macos{{major}}.{{minor}} when building?

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Ticket URL: <https://trac.macports.org/ticket/62934#comment:13>
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