pkg-config

gistfile1.txt

$ ./configure --prefix=/usr/local --disable-programs --disable-doc --disable-everything --enable-protocol=file --enable-libopus --enable-decoder=aac --enable-decoder=aac_latm --enable-decoder=aasc --enable-decoder=flac --enable-decoder=gif --enable-decoder=h264 --enable-decoder=h264_vda --enable-decoder=mp1 --enable-decoder=mp1float --enable-decoder=mp2 --enable-decoder=mp2float --enable-decoder=mp3 --enable-decoder=mp3adu --enable-decoder=mp3adufloat --enable-decoder=mp3float --enable-decoder=mp3on4 --enable-decoder=mp3on4float --enable-decoder=mpeg4 --enable-decoder=msmpeg4v2 --enable-decoder=msmpeg4v3 --enable-decoder=opus --enable-decoder=vorbis --enable-decoder=wavpack --enable-decoder=wmalossless --enable-decoder=wmapro --enable-decoder=wmav1 --enable-decoder=wmav2 --enable-decoder=wmavoice --enable-encoder=libopus --enable-hwaccel=mpeg4_videotoolbox --enable-hwaccel=h264_vda --enable-hwaccel=h264_videotoolbox --enable-parser=aac --enable-parser=aac_latm --enable-parser=flac --enable-parser=h264 --enable-parser=mpeg4video --enable-parser=mpegaudio --enable-parser=opus --enable-parser=vorbis --enable-demuxer=aac --enable-demuxer=flac --enable-demuxer=gif --enable-demuxer=h264 --enable-demuxer=mov --enable-demuxer=mp3 --enable-demuxer=ogg --enable-demuxer=wav --enable-muxer=ogg --enable-muxer=opus --extra-cflags="-mmacosx-version-min=10.8" --extra-cxxflags="-mmacosx-version-min=10.8" --extra-ldflags="-mmacosx-version-min=10.8"
ERROR: opus not found using pkg-config

If you think configure made a mistake, make sure you are using the latest
version from Git.  If the latest version fails, report the problem to the
ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
Include the log file "config.log" produced by configure as this will help
solve the problem.
buck:ffmpeg jackley$ less config.log
buck:ffmpeg jackley$ pkg-config --exists --print-errors opus
Package opus was not found in the pkg-config search path.
Perhaps you should add the directory containing `opus.pc'
to the PKG_CONFIG_PATH environment variable
No package 'opus' found

# here's my pkg-config path

$ echo $PKG_CONFIG_PATH
/usr/local/lib/pkgconfig:/usr/lib/pkgconfig:/usr/X11/lib/pkgconfig:/usr/local/lib/pkgconfig:/usr/lib/pkgconfig:/usr/X11/lib/pkgconfig

# here's opus.pc sitting in /usr/local/lib/pkconfig:

$ ls -la /usr/local/lib/pkgconfig/opus.pc
-rw-r--r--  1 root  admin  351 Sep  9 14:59 /usr/local/lib/pkgconfig/opus.pc