[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 kencu):

 you're missing the isysroot, at least.

 Have you installed either Xcode or the CLTs (or both, ideally)?

 And then you have to open Xcode at least once, so it can install a bunch
 of stuff.

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Ticket URL: <https://trac.macports.org/ticket/66352#comment:10>
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