[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
-----------------------+----------------------------
  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 jmroot):

 All I had on my system when I reproduced the issue was one file dating
 from 2020:
 {{{
 % ls -lR /Library/Developer/CommandLineTools/usr/include/c++
 total 0
 drwxr-xr-x  3 root  wheel  96 12 Dec  2023 v1

 /Library/Developer/CommandLineTools/usr/include/c++/v1:
 total 32
 -rw-r--r--  1 root  wheel  14688 22 Dec  2020 __cxx_version
 }}}

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Ticket URL: <https://trac.macports.org/ticket/70750#comment:63>
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