[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 wdormann):

 I suspect that the contents of the directory are artifacts of what
 versions of CLT were ever installed. So the contents of the directory will
 depend on what versions of the CLT were installed in the past.  If
 installing new CLT doesn't clean up old directory contents, then it's a
 crap shoot as to what the actual contents are.

 However the mere presence of the directory (regardless of contents) will
 break some ports.

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Ticket URL: <https://trac.macports.org/ticket/70750#comment:70>
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