[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 lcvisser):

 Replying to [comment:91 jmroot]:
 > Replying to [comment:88 lcvisser]:
 > > The strange thing is (or at least, the part I don't understand): I can
 build C++ applications just fine. The sample provided in comment:75
 compiles without error, so does all my normal work (although I use CMake,
 which may set some paths differently).
 >
 > As your `clang --version` output shows, you are using Xcode, not the
 CLTs. If you `export DEVELOPER_DIR=/Library/Developer/CommandLineTools`
 before trying the example, you should reproduce the issue. This happens
 because /usr/bin/clang is a shim that finds and runs the real compiler
 based on your settings.

 Ah, yes, you're right. With the DEVELOPER_DIR I can reproduce it with the
 example. Thanks!

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Ticket URL: <https://trac.macports.org/ticket/70750#comment:92>
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