[MacPorts] #54754: qt5-qtbase @5.8.0_0 fails to build on MacOS 10.13

[MacPorts]

#54754: qt5-qtbase @5.8.0_0 fails to build on MacOS 10.13
-------------------------+---------------------------------
  Reporter:  rex4539     |      Owner:  MarcusCalhoun-Lopez
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.4.99
Resolution:              |   Keywords:  highsierra
      Port:  qt5-qtbase  |
-------------------------+---------------------------------

Comment (by mndavidoff):

 The same build failure occurs on macOS 10.12.6 with Xcode 9.0.

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Ticket URL: <https://trac.macports.org/ticket/54754#comment:2>
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