[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 kencu):

 On an M! Mac I upgraded the CLTs and got the same error listed here.

 I downloaded the current Xcode 16 CLTs from
 https://developer.apple.com/download/all/ and installed them and got the
 same error.

 I downloaded the new Xcode 16.1 beta CLTs from
 https://developer.apple.com/download/all/ and installed them and got the
 same error.

 Then I blew out the CLTs with {{{ sudo rm -rf
 /Library/Developer/CommandLineTools}}} and installed the current CLTs
 (Xcode 16, not Xcode 16.1 beta) and then everything works fine.

 Go figure.

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Ticket URL: <https://trac.macports.org/ticket/70750#comment:34>
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