[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:            |
-----------------------+----------------------------

Comment (by 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.

-- 
Ticket URL: <https://trac.macports.org/ticket/70750#comment:91>
MacPorts <https://www.macports.org/>
Ports system for macOS