[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 pcmock):

 I've tried the {{{alias}}} and {{{ln -s}}} fixes in those tickets. I've
 also had a similar problem with qt5-qtbase reported in ticket 62934 (9
 months ago), and I tried editing the SDK lines in {{{macx.conf}}} too.
 This time none of these "fixes" work.  I've looked at a few other qt5
 related tickets, and this problem seems to recur sporadically.  I'm sure
 the fix is similar to what I've already tried, but it's still hard to
 find.

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Ticket URL: <https://trac.macports.org/ticket/64713#comment:2>
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