[MacPorts] #61921: qt5-qtwebengine @5.15.2: does not build on macOS 10.13 with Xcode 9

[MacPorts]

#61921: qt5-qtwebengine @5.15.2: does not build on macOS 10.13 with Xcode 9
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  Reporter:  dliessi          |      Owner:  (none)
      Type:  defect           |     Status:  new
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:
Resolution:                   |   Keywords:  highsierra
      Port:  qt5-qtwebengine  |
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Comment (by kencu):

 It would be a shame, and a moderate project, to have to create a whole
 plethora of qt514 ports just for this one thing, holding back to Xcode9 on
 the 10.13 buildbot.

 And sooner or later, things would come along that requrie qt515 and then
 10.13 would (needlessly) be left behind...)

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Ticket URL: <https://trac.macports.org/ticket/61921#comment:1>
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