[MacPorts] #64713: qscintilla-qt5: xcrun: error: SDK "macosx11" cannot be located

[MacPorts]

#64713: qscintilla-qt5: xcrun: error: SDK "macosx11" cannot be located
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  Reporter:  pcmock          |      Owner:  michaelld
      Type:  defect          |     Status:  assigned
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:
Resolution:                  |   Keywords:
      Port:  qscintilla-qt5  |
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Comment (by michaelld):

 Interesting! I'll try to allocate some time to experiment with
 `DEVELOPER_DIR` now ... very curious how that might impact this issue!

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Ticket URL: <https://trac.macports.org/ticket/64713#comment:19>
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