[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 kencu):

 "port diagnose" should point out this issue, if it doesn't already. And
 probably point out if the Xcode and CLTs on a given system, especially one
 of the older systems that aren't being updated any longer, are not the
 latest (supported) version.

 @catap just went down this rabbit hole on 10.7 a short while ago, opening
 upstream issues, generating patches, all because his system was out-of-
 whack, so you have lots of company.

 We've seen this many times over the years.

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Ticket URL: <https://trac.macports.org/ticket/66129#comment:8>
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