[MacPorts] #71479: qt5 5.15.x does not build on Mojave and earlier; different default needed there

[MacPorts]

#71479: qt5 5.15.x does not build on Mojave and earlier; different default needed
there
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  Reporter:  barracuda156             |      Owner:  MarcusCalhoun-Lopez
      Type:  defect                   |     Status:  assigned
  Priority:  Normal                   |  Milestone:
 Component:  ports                    |    Version:  2.10.5
Resolution:                           |   Keywords:
      Port:  qt5-qttools, qt5-qtbase  |
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Comment (by tomio-arisaka):

 On macOS High Sierra, I'm using qt5 @5.15.12 as follows:
 {{{
 $ port installed 'qt5*' and active
 The following ports are currently installed:
   qt5-qt3d @5.15.12_0 (active)
   qt5-qtbase @5.15.12_1+openssl (active)
   qt5-qtdeclarative @5.15.12_0 (active)
   qt5-qtgamepad @5.15.12_0 (active)
   qt5-qtimageformats @5.15.12_0 (active)
   qt5-qtmacextras @5.15.12_0 (active)
   qt5-qtsvg @5.15.12_0 (active)
   qt5-qttools @5.15.12_0 (active)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/71479#comment:5>
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