[MacPorts] #67404: libheif @1.16.1_0: error: non-portable path to file '<DAV1D/xxx.h>' and '<AOM/xxx.h>'

[MacPorts]

#67404: libheif @1.16.1_0: error: non-portable path to file '<DAV1D/xxx.h>' and
'<AOM/xxx.h>'
-------------------------+-----------------------
  Reporter:  cave-canem  |      Owner:  mascguy
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.8.1
Resolution:              |   Keywords:  Mavericks
      Port:  libheif     |
-------------------------+-----------------------

Comment (by mascguy):

 It looks (?) like you may have a default MacPorts Clang configured. Can
 you run the following, and paste in the output: `port select clang`.

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Ticket URL: <https://trac.macports.org/ticket/67404#comment:8>
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