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

[MacPorts]

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

Comment (by ryandesign):

 Replying to [ticket:63714 tglsfdc]:
 > on a just-updated-to-macOS-12.0.1 2020 Mac M1 mini

 Make sure that you have installed both a macOS-12-compatible Xcode and a
 matching version of the Xcode command line tools. There is (or was) a
 macOS bug that prevents macOS from automatically updating the command line
 tools so you have to do so manually.

-- 
Ticket URL: <https://trac.macports.org/ticket/63714#comment:5>
MacPorts <https://www.macports.org/>
Ports system for macOS