[MacPorts] #54044: Could not resolve SDK Path for 'macosx10.11'

[MacPorts]

#54044: Could not resolve SDK Path for 'macosx10.11'
-------------------------+---------------------------------
  Reporter:  mouse07410  |      Owner:  MarcusCalhoun-Lopez
      Type:  defect      |     Status:  accepted
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  qt5-qtbase  |
-------------------------+---------------------------------

Comment (by MarcusCalhoun-Lopez):

 This is a symptom of the same problem as #55195.[[BR]]
 Qt was built using a version of Xcode that had the 10.11 SDK, which was
 then recorded in {{{${prefix}/libexec/qt5/mkspecs/qdevice.pri}}}.[[BR]]
 Later, Xcode was upgraded to a version that no longer possessed the SDK,
 but {{{qmake}}} continues to look for it.

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Ticket URL: <https://trac.macports.org/ticket/54044#comment:4>
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