ffmpeg cannot be eme

gcc -Wl,--warn-common -rdynamic -g  -o ffmpeg_g ffmpeg.o cmdutils.o -L./libavfor mat -lavformat -L./libavcodec -lavcodec -lm -lz -ldl -logg -lvorbis -lvorbisenc
./libavcodec/libavcodec.so: undefined reference to `bone'
./libavcodec/libavcodec.so: undefined reference to `w05'
./libavcodec/libavcodec.so: undefined reference to `wm1010'
./libavcodec/libavcodec.so: undefined reference to `ff_pw_3'
./libavcodec/libavcodec.so: undefined reference to `ff_pw_20'
./libavcodec/libavcodec.so: undefined reference to `d40000'
./libavcodec/libavcodec.so: undefined reference to `w20'
collect2: ld returned 1 exit status
make: *** [ffmpeg_g] Error 1

!!! ERROR: media-video/ffmpeg-0.4.7 failed.
!!! Function src_compile, Line 54, Exitcode 2