libheif fails to build for non-portable paths

[rmottola (Riccardo)]

On 10.5 64bit with clang 11 I get this issue:

/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_multimedia_libheif/libheif/work/libheif-1.17.6/libheif/plugins/decoder_aom.cc:28:10: error: non-portable path to file '<AOM/aom_decoder.h>'; specified path differs in case from file name on disk [-Werror,-Wnonportable-include-path]
#include <aom/aom_decoder.h>
         ^~~~~~~~~~~~~~~~~~~
         <AOM/aom_decoder.h>
In file included from /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_multimedia_libheif/libheif/work/libheif-1.17.6/libheif/plugins/decoder_aom.cc:28:
/opt/local/include/aom/aom_decoder.h:33:10: error: non-portable path to file '"AOM/aom_codec.h"'; specified path differs in case from file name on disk [-Werror,-Wnonportable-include-path]
#include "aom/aom_codec.h"
         ^~~~~~~~~~~~~~~~~
         "AOM/aom_codec.h"

It doesn't look system related, but really a case mismatch. I wonder why it doesn't happen elsewhere?

To be honest I can't even find where "AOM/aom_codec.h" is used, by grepping I find only the non-cap version.

[mascguy (Christopher Nielsen)]

Duplicate of issue:67404