[MacPorts] #70750: MacOS Sequoia: C++ headers are not found with CLTs installed

[MacPorts]

#70750: MacOS Sequoia: C++ headers are not found with CLTs installed
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  Reporter:  SaintBol  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  sequoia
      Port:            |
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Comment (by jmroot):

 Thanks Ken. With that information I was able to create working and non-
 working CLT installations and recursively diff them. It turns out the
 problematic leftover is the
 `/Library/Developer/CommandLineTools/usr/include/c++` directory, which
 doesn't exist in a working installation, and when deleted from a broken
 one makes it work.

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Ticket URL: <https://trac.macports.org/ticket/70750#comment:42>
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