[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 ldionne):

 Replying to [comment:61 wdormann]:
 > I shared a list of the filenames from my (problematic) system above.
 > Do you need an actual tarball of the directory?

 Yes, that would be useful!

 Indeed, the mere presence of
 `/Library/Developer/CommandLineTools/usr/include/c++/v1` will trip up the
 compiler. Clang looks at whether that directory exists, and if so, it
 tries to use the headers at that location. When the headers in that
 location are incomplete/stale, things break.

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Ticket URL: <https://trac.macports.org/ticket/70750#comment:65>
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