[MacPorts] #66611: py311-pyqt5 configure error on 10.13.6, ports 2.8.0

[MacPorts]

#66611: py311-pyqt5 configure error on 10.13.6, ports 2.8.0
--------------------------+----------------------------
  Reporter:  rufty        |      Owner:  reneeotten
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  sdk-path pyqt5
      Port:  py311-pyqt5  |
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Comment (by kencu):

 this is likely happening because the user is on 10.13, but apparently has
 only a {{{MacOSX10.14.sdk}}} in the SDKs folder.

 MacPorts works best having a system-matching SDK available in the two
 needed locations, otherwise issues such as this can arise.

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Ticket URL: <https://trac.macports.org/ticket/66611#comment:3>
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