[MacPorts] #66129: Pythons +universal build failure on 10.8

[MacPorts]

#66129: Pythons +universal build failure on 10.8
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  Reporter:  barracuda156                   |      Owner:  jmroot
      Type:  defect                         |     Status:  closed
  Priority:  Normal                         |  Milestone:
 Component:  ports                          |    Version:  2.8.0
Resolution:  worksforme                     |   Keywords:  mountainlion
      Port:  python310, python39, python38  |
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Comment (by barracuda156):

 Ken, Joshua: Thank you, and sorry if it is something wrong with my 10.8.5.
 While I did not tweak anything there (Macports uses default settings and
 compilers), it may be the case that something is not set properly which I
 am not aware of (I do not use 10.8.5 normally, it is just for occasional
 testing prior to PRs). Xcode did not show any available updates though
 last time I checked in the settings.

 How do I ensure correct CLT are installed? On 10.5–10.6 they just ship
 with Xcode.

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Ticket URL: <https://trac.macports.org/ticket/66129#comment:6>
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