[MacPorts] #70750: C++ headers are not found after updating to CLTs version 16.0

[MacPorts]

#70750: C++ headers are not found after updating to CLTs version 16.0
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  Reporter:  SaintBol  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  sequoia sonoma
      Port:            |
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Comment (by mouse07410):

 > I haven't tried removing {{{/Library/Developer/CommandLineTools}}} and
 then reinstalling the CLTs using the {{{xcode-select}}} method. Perhaps it
 works as well. A user above said it didn't work for him, but there is some
 indication there of a mixup in versions.

 I did not have a good experience doing this. I'm pretty sure there was no
 version mixup in my setup. Via .dmg seems the only reliable method to
 install CLT, though I wish that Macports would not insist on CLT in
 presence of the "full" Xcode.

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Ticket URL: <https://trac.macports.org/ticket/70750#comment:47>
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