[MacPorts] #63877: qt5-qtwebkit fails to build with Xcode 13.1 Big Sur and Monterey 12.0.1

[MacPorts]

#63877: qt5-qtwebkit fails to build with Xcode 13.1 Big Sur and Monterey 12.0.1
---------------------------+---------------------------------
  Reporter:  6aKa          |      Owner:  MarcusCalhoun-Lopez
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.1
Resolution:                |   Keywords:
      Port:  qt5-qtwebkit  |
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Comment (by ballapete):

 I have a similar failure when I try to build `NS variant of GNU Emacs
 28.0.90` outside of MacPorts. I configure with `LDFLAGS=-v -arch x86_64
 -Wl,-bind_at_load -Wl,-t` and can see which C header files are used. With
 Xcode 13 installed I can clearly see that configuration stops when
 `usability of AppKit/AppKit.h` is checked. When I tell configure to first
 search /usr/bin and some time later /opt/local/bin (by using `env PATH=…`)
 configuration succeeds because macOS' Clang 13 is used. The cause of at
 least my failure is that `MacPorts' Clang 11` uses C header files from
 Xcode 13. This certainly cannot work.

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Ticket URL: <https://trac.macports.org/ticket/63877#comment:13>
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