[MacPorts] #65530: qt55-qt3d @5.5.1_3: build fails due to assimp

[MacPorts]

#65530: qt55-qt3d @5.5.1_3: build fails due to assimp
---------------------------+---------------------------------
  Reporter:  chrstphrchvz  |      Owner:  MarcusCalhoun-Lopez
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.2
Resolution:                |   Keywords:
      Port:  qt55-qt3d     |
---------------------------+---------------------------------

Comment (by chrstphrchvz):

 Replying to [ticket:65530 chrstphrchvz]:
 > I am not aware how to control `CXXFLAGS` for Qt module ports and
 possibly set `-std=c++11`.

 Found it: `qt5.cxxflags-append -std=c++11`

 [https://github.com/macports/macports-ports/pull/15480]

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Ticket URL: <https://trac.macports.org/ticket/65530#comment:2>
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