It fails with the following message: i386-pc-solaris2.10-gcc -L"/nilfisk/home/dve/gentoo-kde/var/tmp/portage/media-video/ffmpeg-0.5_p21602/work/ffmpeg-0.5_p21602"/libavcodec -L"/nilfisk/home/dve/gentoo-kde/var/tmp/portage/media-video/ffmpeg-0.5_p21602/work/ffmpeg-0.5_p21602"/libavdevice -L"/nilfisk/home/dve/gentoo-kde/var/tmp/portage/media-video/ffmpeg-0.5_p21602/work/ffmpeg-0.5_p21602"/libavfilter -L"/nilfisk/home/dve/gentoo-kde/var/tmp/portage/media-video/ffmpeg-0.5_p21602/work/ffmpeg-0.5_p21602"/libavformat -L"/nilfisk/home/dve/gentoo-kde/var/tmp/portage/media-video/ffmpeg-0.5_p21602/work/ffmpeg-0.5_p21602"/libavutil -L"/nilfisk/home/dve/gentoo-kde/var/tmp/portage/media-video/ffmpeg-0.5_p21602/work/ffmpeg-0.5_p21602"/libpostproc -L"/nilfisk/home/dve/gentoo-kde/var/tmp/portage/media-video/ffmpeg-0.5_p21602/work/ffmpeg-0.5_p21602"/libswscale -Wl,--warn-common -Wl,--as-needed -Wl,-rpath-link,"/nilfisk/home/dve/gentoo-kde/var/tmp/portage/media-video/ffmpeg-0.5_p21602/work/ffmpeg-0.5_p21602"/libpostproc -Wl,-rpath-link,"/nilfisk/home/dve/gentoo-kde/var/tmp/portage/media-video/ffmpeg-0.5_p21602/work/ffmpeg-0.5_p21602"/libswscale -Wl,-rpath-link,"/nilfisk/home/dve/gentoo-kde/var/tmp/portage/media-video/ffmpeg-0.5_p21602/work/ffmpeg-0.5_p21602"/libavfilter -Wl,-rpath-link,"/nilfisk/home/dve/gentoo-kde/var/tmp/portage/media-video/ffmpeg-0.5_p21602/work/ffmpeg-0.5_p21602"/libavdevice -Wl,-rpath-link,"/nilfisk/home/dve/gentoo-kde/var/tmp/portage/media-video/ffmpeg-0.5_p21602/work/ffmpeg-0.5_p21602"/libavformat -Wl,-rpath-link,"/nilfisk/home/dve/gentoo-kde/var/tmp/portage/media-video/ffmpeg-0.5_p21602/work/ffmpeg-0.5_p21602"/libavcodec -Wl,-rpath-link,"/nilfisk/home/dve/gentoo-kde/var/tmp/portage/media-video/ffmpeg-0.5_p21602/work/ffmpeg-0.5_p21602"/libavutil -Wl,-Bsymbolic -o ffmpeg_g ffmpeg.o cmdutils.o -lavdevice -lavfilter -lavformat -lavcodec -lpostproc -lswscale -lavutil -lrt -lz -lbz2 -lm -lX11 -lXext -lXfixes /nilfisk/home/dve/gentoo-kde/var/tmp/portage/media-video/ffmpeg-0.5_p21602/work/ffmpeg-0.5_p21602/libavformat/libavformat.so: undefined reference to `__builtin_stdarg_start' collect2: ld returned 1 exit status
I have ffmpeg-0.6_p25767 installed here (Sol10/x86)