[MacPorts] #55195: openconnect-gui @1.3: Project ERROR: Could not resolve SDK --show-sdk-path for 'macosx10.12'

[MacPorts]

#55195: openconnect-gui @1.3: Project ERROR: Could not resolve SDK --show-sdk-path
for 'macosx10.12'
-------------------------+---------------------------------
  Reporter:  rsuray      |      Owner:  MarcusCalhoun-Lopez
      Type:  defect      |     Status:  accepted
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.4.2
Resolution:              |   Keywords:
      Port:  qt5-qtbase  |
-------------------------+---------------------------------

Comment (by MarcusCalhoun-Lopez):

 This is a symptom of the same problem as #54044.[[BR]]
 Qt was built using a version of Xcode that had the 10.12 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/55195#comment:4>
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