[MacPorts] #57189: libomp will not build under Xcode 10 + Mojave

[MacPorts]

#57189: libomp will not build under Xcode 10 + Mojave
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 Reporter:  pmetzger  |      Owner:  eborisch
     Type:  defect    |     Status:  assigned
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:  libomp
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 libomp won't build under Xcode 10 + Mojave, and unfortunately it's a
 prerequisite for qt5

 Build log attached

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Ticket URL: <https://trac.macports.org/ticket/57189>
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