[MacPorts] #70750: MacOS Sequoia: C++ headers are not found with CLTs installed

[MacPorts]

#70750: MacOS Sequoia: C++ headers are not found with CLTs installed
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  Reporter:  SaintBol  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  sequoia
      Port:            |
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Comment (by ryandesign):

 `xcode-select -p` is useful for telling you what Xcode or command line
 tools you have selected. MacPorts will use the command line tools unless
 `use_xcode yes` is set in the portfile.

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Ticket URL: <https://trac.macports.org/ticket/70750#comment:24>
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