Running debuild gets me a lot further, but compilation still fails with the error below, which googling like an optimization issue.
third_party/ffmpeg/patched-ffmpeg-mt/libavcodec/x86/h264dsp_mmx.c: In function ‘h264_h_loop_filter_luma_mmx2’: third_party/ffmpeg/patched-ffmpeg-mt/libavcodec/x86/dsputil_mmx.c:736: error: can't find a register in class ‘GENERAL_REGS’ while reloading ‘asm’ third_party/ffmpeg/patched-ffmpeg-mt/libavcodec/x86/dsputil_mmx.c:736: error: ‘asm’ operand has impossible constraints third_party/ffmpeg/patched-ffmpeg-mt/libavcodec/x86/dsputil_mmx.c:736: error: ‘asm’ operand has impossible constraints third_party/ffmpeg/patched-ffmpeg-mt/libavcodec/x86/dsputil_mmx.c:736: error: ‘asm’ operand has impossible constraints third_party/ffmpeg/patched-ffmpeg-mt/libavcodec/x86/dsputil_mmx.c:736: error: ‘asm’ operand has impossible constraints third_party/ffmpeg/patched-ffmpeg-mt/libavcodec/x86/h264dsp_mmx.c:634: error: ‘asm’ operand has impossible constraints third_party/ffmpeg/patched-ffmpeg-mt/libavcodec/x86/dsputil_mmx.c:736: error: ‘asm’ operand has impossible constraints third_party/ffmpeg/patched-ffmpeg-mt/libavcodec/x86/dsputil_mmx.c:736: error: ‘asm’ operand has impossible constraints make[1]: *** [out/Release/obj.target/ffmpegsumo/third_party/ffmpeg/patched-ffmpeg-mt/libavcodec/x86/dsputil_mmx.o] Error 1 make[1]: Leaving directory `/usr/local/src/chromium-browser/chromium-browser-6.0.472.63~r59945/src'
make: *** [debian/stamp-makefile-build] Error 2 dpkg-buildpackage: failure: debian/rules build gave error exit status 2 debuild: fatal error at line 1319: dpkg-buildpackage -rfakeroot -D -us -uc failed
