[MacPorts] #60833: qt4-mac: assumes macOS version is always 10.x

[MacPorts]

#60833: qt4-mac: assumes macOS version is always 10.x
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  Reporter:  ryandesign  |      Owner:  michaelld
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:  bigsur
      Port:  qt4-mac     |
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Comment (by cjones051073):

 Ran into this as its a dep. of a number of ports I use, so ...

 https://github.com/macports/macports-ports/pull/9184

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Ticket URL: <https://trac.macports.org/ticket/60833#comment:7>
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