gcc -L/tmp/ffmpeg/libavformat -L/tmp/ffmpeg/libavcodec 
-L/tmp/ffmpeg/libavutil -Wl,--warn-common   -rdynamic -export-dynamic 
-Wl,--as-needed -Wl,-rpath-link,/tmp/ffmpeg/libavcodec 
-Wl,-rpath-link,/tmp/ffmpeg/libavformat 
-Wl,-rpath-link,/tmp/ffmpeg/libavutil -g -o ffmpeg_g ffmpeg.o cmdutils.o 
-lavformat -lavcodec -lavutil -lm -lz -ldl
/tmp/ffmpeg/libavformat/libavformat.a(avs.o): In function 
`avs_read_audio_packet':/tmp/ffmpeg/libavformat/avs.c:128: undefined 
reference to `voc_get_packet'
:/tmp/ffmpeg/libavformat/avs.c:128: undefined reference to `voc_get_packet'
/tmp/ffmpeg/libavcodec/libavcodec.a(parser.o): In function 
`cavsvideo_parse':/tmp/ffmpeg/libavcodec/parser.c:576: undefined 
reference to `ff_cavs_find_frame_end'
collect2: ld returned 1 exit status
make: *** [ffmpeg_g] Error 1

$ gcc --version
gcc (GCC) 4.0.3 (Ubuntu 4.0.3-1ubuntu5)
$ ld --version
GNU ld version 2.16.91 20060118 Debian GNU/Linux