[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):

 @baracuda156 it seems like Qt 5.14.x worked on High Sierra and Mojave -
 correct? All earliers OSes already specify an older {}}qtXY}}} port so
 there the "failure" on link you mention is irrelevant/expected.

 If, so it would be possible to resurrect the Portfile for {{{qt5}}} before
 it was updated to 5.15.x branch and add that as {{{qt514}}} and update the
 logic in the PortGroup(s) so that it will be used on 10.13 and 10.14.


 Is that what you had in mind?

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Ticket URL: <https://trac.macports.org/ticket/71479#comment:3>
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