[root@md-red5 ffmpeg]# ./configure --enable-gpl --enable-liba52 --enable-libgsm --enable-libxvid --enable-libamr_nb --enable-libamr_wb --enable-libmp3lame --enable-libogg --enable-libvorbis --enable-libfaac --enable-libfaad --enable-shared --enable-rtmp
Unknown option "--enable-liba52".