On Fedora 9, gcc-4.3.2: gcc -L"/usr/src/redhat/BUILD/ffmpeg"/libavfilter -L"/usr/src/redhat/BUILD/ffmpeg"/libpostproc -L"/usr/src/redhat/BUILD/ffmpeg"/libswscale -L"/usr/src/redhat/BUILD/ffmpeg"/libavdevice -L"/usr/src/redhat/BUILD/ffmpeg"/libavformat -L"/usr/src/redhat/BUILD/ffmpeg"/libavcodec -L"/usr/src/redhat/BUILD/ffmpeg"/libavutil -rdynamic -export-dynamic -Wl,--warn-common -Wl,--as-needed -Wl,-rpath-link,"/usr/src/redhat/BUILD/ffmpeg"/libpostproc -Wl,-rpath-link,"/usr/src/redhat/BUILD/ffmpeg"/libswscale -Wl,-rpath-link,"/usr/src/redhat/BUILD/ffmpeg"/libavfilter -Wl,-rpath-link,"/usr/src/redhat/BUILD/ffmpeg"/libavdevice -Wl,-rpath-link,"/usr/src/redhat/BUILD/ffmpeg"/libavformat -Wl,-rpath-link,"/usr/src/redhat/BUILD/ffmpeg"/libavcodec -Wl,-rpath-link,"/usr/src/redhat/BUILD/ffmpeg"/libavutil -Wl,-Bsymbolic -o ffmpeg_g ffmpeg.o cmdutils.o -lavfilter -lpostproc -lswscale -lavdevice -lavformat -lavcodec -lavutil -lz -lbz2 -pthread -lm -la52 -ldirac_decoder -ldirac_encoder -lfaac -lfaad -lgsm -lmp3lame -lm -lschroedinger-1.0 -lpthread -loil-0.3 -lm -lrt -ltheora -logg -lvorbisenc -lvorbis -logg -lx264 -lm -lxvidcore -ldl -ldl /usr/src/redhat/BUILD/ffmpeg/libavcodec/libavcodec.so: undefined reference to `ff_mdct_init' /usr/src/redhat/BUILD/ffmpeg/libavcodec/libavcodec.so: undefined reference to `ff_fft_init' /usr/src/redhat/BUILD/ffmpeg/libavcodec/libavcodec.so: undefined reference to `ff_interleaved_se_golomb_vlc_code' /usr/src/redhat/BUILD/ffmpeg/libavcodec/libavcodec.so: undefined reference to `ff_ue_golomb_len' .............. which are all defined in the include files in ffmpeg/libavcodec. libavcodec.so.52 builds cleanly, or at least without any errors. FWIW: + ./configure --prefix=/usr --enable-libmp3lame --enable-libvorbis --enable-libtheora --enable-libfaad --enable-libfaac --enable-libgsm --enable-libxvid --enable-libx264 --enable-liba52 --enable-liba52bin --enable-postproc --enable-shared --enable-pthreads --enable-gpl --enable-nonfree --enable-swscale --enable-avfilter --enable-avfilter-lavf --cpu=k8 --disable-debug --enable-libschroedinger --disable-encoder=libschroedinger --enable-libdirac --disable-decoder=libdirac sean