[FFmpeg-user] Can't compile current git: "undefined reference to `ff_mix_6_to_1_fltp_flt_fma4'"

[Peter B.]

On the same machine I've compiled ffmpeg a thousand times now, without  
problems, I suddenly can't compile the current git version, and "make"  
exits with the following error:

[quote]
libavresample/libavresample.a(audio_mix_init.o): In function  
`ff_audio_mix_init_x86':
/home/xxx/install/ffmpeg/ffmpeg-git/libavresample/x86/audio_mix_init.c:207:  
undefined reference to `ff_mix_3_to_1_fltp_flt_fma4'
...
...
/home/xxx/install/ffmpeg/ffmpeg-git/libavresample/x86/audio_mix_init.c:212:  
undefined reference to `ff_mix_8_to_2_s16p_flt_fma4'
collect2: ld returned 1 exit status
[/quote]

I've tried a fresh "git pull" into an empty directory - same error.

Could anyone please tell me what I'm doing wrong here? My setup is a  
Debian 6.0.5 squeeze machine.

Thank you very much,
Pb