[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 jariperttunen):

 port install qt4-mac fails on Big Sur (version 11.0.1) \\
 From qt4-mac/main.log file:\\
 :info:configure clang: error: invalid deployment target for -stdlib=libc++
 (requires OS X 10.7 or later)

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Ticket URL: <https://trac.macports.org/ticket/60833#comment:1>
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