[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:  closed
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:  fixed       |   Keywords:
      Port:  cmake       |
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Comment (by michaelld):

 @sambthompson : great! hopefully except for Py27 this fix will do the
 trick across both macOS & CPU & support Python

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Ticket URL: <https://trac.macports.org/ticket/63765#comment:20>
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