[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 reneeotten):

 On the other hand, it seem from a quick, cursory look that only the
 {{{qt5-qttools}}} subport doesn't build on these two systems. In that
 case, it would be more prudent for someone who is interested on these
 older systems to actually fix that specific issues and/or check with
 upstream if there is a fix proposed already...

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Ticket URL: <https://trac.macports.org/ticket/71479#comment:4>
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