[MacPorts] #63714: python39 @3.9.7: build failure on Monterey/M1

[MacPorts]

#63714: python39 @3.9.7: build failure on Monterey/M1
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  Reporter:  tglsfdc   |      Owner:  jmroot
      Type:  defect    |     Status:  accepted
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.7.1
Resolution:            |   Keywords:  monterey
      Port:  python39  |
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Comment (by tglsfdc):

 Replying to [comment:5 ryandesign]:
 > There is (or was) a macOS bug that prevents macOS from automatically
 updating the command line tools so you have to do so manually.

 Oh, hmm ... what's the process for doing that then?  If I try, say,

 $ xcode-select --install

 I get

 xcode-select: error: command line tools are already installed, use
 "Software Update" to install updates

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Ticket URL: <https://trac.macports.org/ticket/63714#comment:6>
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