There are problems using pkg-config, and a better solution is being
worked on.
Originally committed as revision 22914 to svn://svn.ffmpeg.org/ffmpeg/trunk
enabled libspeex && require libspeex speex/speex.h speex_decoder_init -lspeex
enabled libtheora && require libtheora theora/theoraenc.h th_info_init -ltheoraenc -ltheoradec -logg
enabled libvorbis && require libvorbis vorbis/vorbisenc.h vorbis_info_init -lvorbisenc -lvorbis -logg
-enabled libx264 && require libx264 x264.h x264_encoder_encode $(pkg-config --libs x264 2> /dev/null) -lx264 -lm &&
+enabled libx264 && require libx264 x264.h x264_encoder_encode -lx264 -lm &&
{ check_cpp_condition x264.h "X264_BUILD >= 83" ||
die "ERROR: libx264 version must be >= 0.83."; }
enabled libxvid && require libxvid xvid.h xvid_global -lxvidcore