Comment 27 for bug 1749800

OK, I came a bit further, but still reached an error during build process:

[CXX] src/sources/soundsourceflac.cpp
[CXX] src/sources/soundsourceoggvorbis.cpp
[CXX] src/sources/soundsourceopus.cpp
In file included from src/sources/soundsourceopus.cpp:1:
In file included from src/sources/soundsourceopus.h:5:
/usr/local/include/opus/opusfile.h:110:11: error: 'opus_multistream.h' file not
      found with <angled> include; use "quotes" instead
# include <opus_multistream.h>
          ^~~~~~~~~~~~~~~~~~~~
          "opus_multistream.h"
1 error generated.
scons: *** [osx64_build/sources/soundsourceopus.o] Error 1
scons: building terminated because of errors.