[MacPorts] #57193: qt5-qtwebengine fails build with Xcode 10

[MacPorts]

#57193: qt5-qtwebengine fails build with Xcode 10
------------------------------+---------------------------------
  Reporter:  pmetzger         |      Owner:  MarcusCalhoun-Lopez
      Type:  defect           |     Status:  assigned
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:
Resolution:                   |   Keywords:  xcode10
      Port:  qt5-qtwebengine  |
------------------------------+---------------------------------

Comment (by mf2k):

 I'm not clear if this is due to the new build system. The error looks
 different that what we normally see in that case.

-- 
Ticket URL: <https://trac.macports.org/ticket/57193#comment:10>
MacPorts <https://www.macports.org/>
Ports system for macOS