[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 MarcusCalhoun-Lopez):

 I must say, I am at a loss.\\
 I cannot reproduce these errors, but I do not have access to a case-
 sensitive file system.\\

 Could there be two installations of `aom` and `dav1d`, and the compiler is
 finding the wrong one?

 If the compiler is doing something strange, perhaps we can create a simple
 test case.

 If you look through the config.log for libheif, do the values of
 `pkg_cv_dav1d_CFLAGS` and/or `pkg_cv_aom_CFLAGS` give any hints?

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Ticket URL: <https://trac.macports.org/ticket/67404#comment:9>
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