[MacPorts] #63765: cmake +qt5 +docs +python39 hangs during build

[MacPorts]

#63765: cmake +qt5 +docs +python39 hangs during build
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  Reporter:  mouse07410  |      Owner:  michaelld
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  cmake       |
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Comment (by michaelld):

 FYI this testing is on a Mac Mini M1 running macOS 11.6.1 20G224 ; Xcode
 13.1 13A1030d

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Ticket URL: <https://trac.macports.org/ticket/63765#comment:14>
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