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

[MacPorts]

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

 I see the same thing when using `qt5-qtcreator at 4.2.1_0` and same
 `qt5-qtbase` on macosx10.11.6.  Not quite sure how to address.

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Ticket URL: <https://trac.macports.org/ticket/54044#comment:2>
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