[MacPorts] #66352: clang-15: unable to locate default SDK

[MacPorts]

#66352: clang-15: unable to locate default SDK
-----------------------+-----------------------------
  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):

 Thank you for taking the time for me. After rebuilding this port with
 Xcode installed, the issue disappeared. Currently, Clang finds SDKs both
 with and without Xcode.

 P.S. If anyone gets this issue, then the best workaround without Xcode is
 the SDKROOT variable. It should help Clang find a path to the SDK.

 {{{
 export SDKROOT="/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk"
 # or
 export SDKROOT=$(xcrun --show-sdk-path)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/66352#comment:15>
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