[MacPorts] #64570: qt5 asks for clang 7.0 on 10.5.8

[MacPorts]

#64570: qt5 asks for clang 7.0 on 10.5.8
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  Reporter:  barracuda156                  |      Owner:  (none)
      Type:  defect                        |     Status:  new
  Priority:  Normal                        |  Milestone:
 Component:  ports                         |    Version:  2.7.1
Resolution:                                |   Keywords:  powerpc
      Port:  qt53, qt55, qt56, qt57, qt58  |
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Comment (by kencu):

 In my own ports trees, I exclude clang from ever being offered up on
 PowerPC, as it's always wrong to do so (in Jan 2022, at least).

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Ticket URL: <https://trac.macports.org/ticket/64570#comment:5>
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