ffmpeg2 fails to build on netbsd-7

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

Hello,
trying to build ffmpeg2 on netbsd-7/i386 I get:
libavcodec/x86/ac3dsp_init.c: In function 'ac3_downmix_sse':
libavcodec/x86/ac3dsp_init.c:78:5: error: 'asm' operand has impossible constrain
ts
     __asm__ volatile (                                          \
     ^
libavcodec/x86/ac3dsp_init.c:162:9: note: in expansion of macro 'MIX5'
         MIX5(IF0, IF1);
         ^
libavcodec/x86/ac3dsp_init.c:78:5: error: 'asm' operand has impossible constrain
ts
     __asm__ volatile (                                          \
     ^
libavcodec/x86/ac3dsp_init.c:166:9: note: in expansion of macro 'MIX5'
         MIX5(IF1, IF0);
         ^
common.mak:49: recipe for target 'libavcodec/x86/ac3dsp_init.o' failed

Any idea ?

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--