[MacPorts] #70750: C++ headers are not found after updating to CLTs version 16.0

[MacPorts]

#70750: C++ headers are not found after updating to CLTs version 16.0
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  Reporter:  SaintBol  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  sequoia sonoma
      Port:            |
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Comment (by mouse07410):

 > MacPorts will use the command line tools unless {{{use_xcode yes}}} is
 set in the portfile.

 It would be great if one could set {{{use_xcode yes}}} as a global
 Macports option, e.g., in {{{/opt/local/etc/macports/macports.conf}}}.

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Ticket URL: <https://trac.macports.org/ticket/70750#comment:98>
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