[FFmpeg-devel] ffmpeg build failed.

[t66667 at gmail.com]

> /home/ffmpeg/ffmpeg/libavcodec/libavcodec.a(libfaac.o):libfaac.c:(.text+0x3b): 
> undefined reference to `_faacEncOpen'
> /home/ffmpeg/ffmpeg/libavcodec/libavcodec.a(libfaac.o):libfaac.c:(.text+0x45): 
> undefined reference to `_faacEncGetCurrentConfiguration'
> /home/ffmpeg/ffmpeg/libavcodec/libavcodec.a(libfaac.o):libfaac.c:(.text+0x96): 
> undefined reference to `_faacEncClose'
> /home/ffmpeg/ffmpeg/libavcodec/libavcodec.a(libfaac.o):libfaac.c:(.text+0x146): 
> undefined reference to `_faacEncSetConfiguration'
> /home/ffmpeg/ffmpeg/libavcodec/libavcodec.a(libfaac.o):libfaac.c:(.text+0x1ae): 
> undefined reference to `_faacEncGetDecoderSpecificInfo'
> /home/ffmpeg/ffmpeg/libavcodec/libavcodec.a(libfaac.o):libfaac.c:(.text+0x276): 
> undefined reference to `_faacEncEncode'
> /home/ffmpeg/ffmpeg/libavcodec/libavcodec.a(libfaac.o):libfaac.c:(.text+0x2b4): 
> undefined reference to `_faacEncClose'
> collect2: ld returned 1 exit status
> make[1]: *** [ffmpeg_g.exe] Error 1

Can someone tell me why linking has failed when compiled from source 
HEAD ? What is happening to the FAAC lib?