[MacPorts] #66352: clang-15: fatal error: '*.h' file not found

[MacPorts]

#66352: clang-15: fatal error: '*.h' file not found
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  Reporter:  judaew    |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.8.0
Resolution:            |   Keywords:  ventura, x86_64
      Port:  clang-15  |
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Comment (by judaew):

 I was also surprised that it was so. On macOS 12, everything worked for me
 without these settings. I used the pre-compiled version LLVM/Clang from
 MacPorts there. After updating to macOS 13 and building LLVM/Clang, I got
 this issue.

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Ticket URL: <https://trac.macports.org/ticket/66352#comment:7>
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