x86_64-pc-linux-gnu-gcc -I. -Isrc/ -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600 
-DPIC -DZLIB_CONST -DHAVE_AV_CONFIG_H -DBUILDING_swscale -march=native -O2 -pipe   -march=skylake -std=c11 -fPIC -pthread   -I/usr/include/h
arfbuzz -I/usr/include/freetype2 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/uuid -I/usr/include/fribidi  -I/usr/in
clude/libdrm  -I/usr/include/freetype2 -I/usr/include/uuid -I/usr/include/freetype2   -I/usr/include/openh264 -I/usr/include/openjpeg-2.3 -I
/usr/include/opus -I/usr/include/opus -I/usr/include/librsvg-2.0 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/lib64/libffi/i
nclude -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/gdk-pixbuf-2.0 -pthread -I/usr/include/cairo -I/usr/include/pixman-1 -I/u
sr/include/freetype2 -I/usr/include/uuid -I/usr/include/libpng16                       -Wdeclaration-after-statement -Wall -Wdisabled-optimi
zation -Wpointer-arith -Wredundant-decls -Wwrite-strings -Wtype-limits -Wundef -Wmissing-prototypes -Wno-pointer-to-int-cast -Wstrict-protot
ypes -Wempty-body -Wno-parentheses -Wno-switch -Wno-format-zero-length -Wno-pointer-sign -Wno-unused-const-variable -Wno-bool-operation -Wno
-char-subscripts -march=native -O2 -pipe -fno-math-errno -fno-signed-zeros -fno-tree-vectorize -Werror=format-security -Werror=implicit-func
tion-declaration -Werror=missing-prototypes -Werror=return-type -Werror=vla -Wformat -fdiagnostics-color=auto -Wno-maybe-uninitialized -I/us
r/include/SDL2 -D_REENTRANT  -MMD -MF libswscale/x86/yuv2rgb.d -MT libswscale/x86/yuv2rgb.o -c -o libswscale/x86/yuv2rgb.o src/libswscale/x8
6/yuv2rgb.c
nasm -f elf64 -DPIC -I./ -Isrc// -I/var/tmp/portage/media-video/ffmpeg-4.3.1/work/ffmpeg-4.3.1/libswscale/x86/ -Pconfig.asm -MD libswscale/x
86/yuv_2_rgb.d  -o libswscale/x86/yuv_2_rgb.o src/libswscale/x86/yuv_2_rgb.asm
src/libswscale/x86/yuv2rgb.c: In function �<80><98>ff_yuv2rgb_init_x86�<80><99>:
src/libswscale/x86/yuv2rgb.c:120:20: error: �<80><98>yuv420_rgb24_mmxext�<80><99> undeclared (first use in this function); did you mean �
<80><98>yuv420_rgb24_mmx�<80><99>?
  120 |             return yuv420_rgb24_mmxext;
      |                    ^~~~~~~~~~~~~~~~~~~
      |                    yuv420_rgb24_mmx
src/libswscale/x86/yuv2rgb.c:120:20: note: each undeclared identifier is reported only once for each function it appears in
src/libswscale/x86/yuv2rgb.c:122:20: error: �<80><98>yuv420_bgr24_mmxext�<80><99> undeclared (first use in this function); did you mean �
<80><98>yuv420_bgr24_mmx�<80><99>?
  122 |             return yuv420_bgr24_mmxext;
      |                    ^~~~~~~~~~~~~~~~~~~
      |                    yuv420_bgr24_mmx
make: *** [/var/tmp/portage/media-video/ffmpeg-4.3.1/work/ffmpeg-4.3.1/ffbuild/common.mak:59: libswscale/x86/yuv2rgb.o] Error 1
make: *** Waiting for unfinished jobs....
echo skipping strip -x libswscale/x86/yuv_2_rgb.o
skipping strip -x libswscale/x86/yuv_2_rgb.o
echo skipping strip -x libswscale/x86/scale.o
skipping strip -x libswscale/x86/scale.o
 * ERROR: media-video/ffmpeg-4.3.1::gentoo failed (compile phase):
 *   emake failed