>>> ffmpeg 6.1.2 Extracting
xzcat /home/buildroot/instance-0/dl/ffmpeg/ffmpeg-6.1.2.tar.xz | /home/buildroot/instance-0/output-1/host/bin/tar --strip-components=1 -C /home/buildroot/instance-0/output-1/build/ffmpeg-6.1.2   -xf -
>>> ffmpeg 6.1.2 Patching

Applying 0001-swscale-x86-yuv2rgb-Fix-build-without-SSSE3.patch using patch: 
patching file libswscale/x86/yuv2rgb.c

Applying 0002-avcodec-vaapi_h264-skip-decode-if-pic-has-no-slices.patch using patch: 
patching file libavcodec/vaapi_h264.c

Applying 0003-libavutil-Fix-mips-build.patch using patch: 
patching file configure
Hunk #1 succeeded at 2228 (offset 1 line).
Hunk #2 succeeded at 6477 (offset 4 lines).
patching file libavutil/mips/cpu.c

Applying 0004-configure-add-extralibs-to-extralibs_xxx.patch using patch: 
patching file configure
Hunk #1 succeeded at 8136 (offset 150 lines).

Applying 0005-avcodec-mmaldec-Fix-build-error.patch using patch: 
patching file libavcodec/mmaldec.c

Applying 0006-avcodec-pcm-bluray-dvd-Use-correct-pointer-types-on-.patch using patch: 
patching file libavcodec/pcm-bluray.c
patching file libavcodec/pcm-dvd.c

Applying 0007-avutil-hwcontext-vaapi-use-the-correct-type.patch using patch: 
patching file libavutil/hwcontext_vaapi.c
Hunk #1 succeeded at 1203 (offset -22 lines).
>>> ffmpeg 6.1.2 Updating config.sub and config.guess
for file in config.guess config.sub; do for i in $(find /home/buildroot/instance-0/output-1/build/ffmpeg-6.1.2 -name $file); do cp support/gnuconfig/$file $i; done; done
>>> ffmpeg 6.1.2 Patching libtool
>>> ffmpeg 6.1.2 Configuring
(cd /home/buildroot/instance-0/output-1/build/ffmpeg-6.1.2/ && rm -rf config.cache && GIT_DIR=. PATH="/home/buildroot/instance-0/output-1/host/bin:/home/buildroot/instance-0/output-1/host/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" AR="/home/buildroot/instance-0/output-1/host/bin/s390x-buildroot-linux-gnu-gcc-ar" AS="/home/buildroot/instance-0/output-1/host/bin/s390x-buildroot-linux-gnu-as" LD="/home/buildroot/instance-0/output-1/host/bin/s390x-buildroot-linux-gnu-ld" NM="/home/buildroot/instance-0/output-1/host/bin/s390x-buildroot-linux-gnu-gcc-nm" CC="/home/buildroot/instance-0/output-1/host/bin/s390x-buildroot-linux-gnu-gcc" GCC="/home/buildroot/instance-0/output-1/host/bin/s390x-buildroot-linux-gnu-gcc" CPP="/home/buildroot/instance-0/output-1/host/bin/s390x-buildroot-linux-gnu-cpp" CXX="/home/buildroot/instance-0/output-1/host/bin/s390x-buildroot-linux-gnu-g++" FC="/home/buildroot/instance-0/output-1/host/bin/s390x-buildroot-linux-gnu-gfortran" F77="/home/buildroot/instance-0/output-1/host/bin/s390x-buildroot-linux-gnu-gfortran" RANLIB="/home/buildroot/instance-0/output-1/host/bin/s390x-buildroot-linux-gnu-gcc-ranlib" READELF="/home/buildroot/instance-0/output-1/host/bin/s390x-buildroot-linux-gnu-readelf" STRIP="/bin/true" OBJCOPY="/home/buildroot/instance-0/output-1/host/bin/s390x-buildroot-linux-gnu-objcopy" OBJDUMP="/home/buildroot/instance-0/output-1/host/bin/s390x-buildroot-linux-gnu-objdump" AR_FOR_BUILD="/usr/bin/ar" AS_FOR_BUILD="/usr/bin/as" CC_FOR_BUILD="/usr/bin/gcc" GCC_FOR_BUILD="/usr/bin/gcc" CXX_FOR_BUILD="/usr/bin/g++" LD_FOR_BUILD="/usr/bin/ld" CPPFLAGS_FOR_BUILD="-I/home/buildroot/instance-0/output-1/host/include" CFLAGS_FOR_BUILD="-O2 -I/home/buildroot/instance-0/output-1/host/include" CXXFLAGS_FOR_BUILD="-O2 -I/home/buildroot/instance-0/output-1/host/include" LDFLAGS_FOR_BUILD="-L/home/buildroot/instance-0/output-1/host/lib -Wl,-rpath,/home/buildroot/instance-0/output-1/host/lib" FCFLAGS_FOR_BUILD="" DEFAULT_ASSEMBLER="/home/buildroot/instance-0/output-1/host/bin/s390x-buildroot-linux-gnu-as" DEFAULT_LINKER="/home/buildroot/instance-0/output-1/host/bin/s390x-buildroot-linux-gnu-ld" CPPFLAGS="-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64" CFLAGS="-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -O0 -g0 " CXXFLAGS="-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -O0 -g0 " LDFLAGS="" FCFLAGS=" -O0 -g0" FFLAGS=" -O0 -g0" PKG_CONFIG="/home/buildroot/instance-0/output-1/host/bin/pkg-config" STAGING_DIR="/home/buildroot/instance-0/output-1/host/s390x-buildroot-linux-gnu/sysroot" INTLTOOL_PERL=/usr/bin/perl ac_cv_lbl_unaligned_fail=yes ac_cv_func_mmap_fixed_mapped=yes ac_cv_func_memcmp_working=yes ac_cv_have_decl_malloc=yes gl_cv_func_malloc_0_nonnull=yes ac_cv_func_malloc_0_nonnull=yes ac_cv_func_calloc_0_nonnull=yes ac_cv_func_realloc_0_nonnull=yes lt_cv_sys_lib_search_path_spec="" ac_cv_c_bigendian=yes  CFLAGS="-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -O0 -g0 " ./configure --enable-cross-compile --cross-prefix=/home/buildroot/instance-0/output-1/host/bin/s390x-buildroot-linux-gnu- --sysroot=/home/buildroot/instance-0/output-1/host/s390x-buildroot-linux-gnu/sysroot --host-cc="/usr/bin/gcc" --arch="s390x" --target-os="linux" --disable-stripping --pkg-config="/home/buildroot/instance-0/output-1/host/bin/pkg-config" --disable-static --enable-shared --prefix=/usr --enable-avfilter --disable-version3 --enable-logging --enable-optimizations --disable-extra-warnings --enable-avdevice --enable-avcodec --enable-avformat --enable-network --disable-gray --enable-swscale-alpha --disable-small --disable-crystalhd --disable-dxva2 --enable-runtime-cpudetect --disable-hardcoded-tables --disable-mipsdsp --disable-mipsdspr2 --disable-msa --enable-hwaccels --disable-cuda --disable-cuvid --disable-nvenc --disable-avisynth --disable-frei0r --disable-libopencore-amrnb --disable-libopencore-amrwb --disable-libdc1394 --disable-libgsm --disable-libilbc --disable-libvo-amrwbenc --disable-symver --disable-doc --disable-gpl --disable-nonfree --disable-ffmpeg --disable-ffplay --disable-libjack --enable-libv4l2 --disable-ffprobe --enable-libxcb --enable-libxcb-shape --enable-libxcb-shm --enable-libxcb-xfixes --disable-postproc --disable-swscale --disable-indevs --disable-outdevs --enable-pthreads --enable-zlib --enable-bzlib --disable-libfdk-aac --disable-libcdio --enable-gnutls --disable-openssl --disable-libdrm --disable-libopenh264 --enable-libvorbis --enable-muxer=ogg --enable-encoder=libvorbis --disable-vaapi --disable-vdpau --disable-mmal --disable-omx --disable-omx-rpi --enable-libopencv --disable-libopus --disable-libvpx --disable-libass --disable-libbluray --disable-libvpl --disable-libmfx --disable-librtmp --disable-libmp3lame --enable-libmodplug --disable-libspeex --enable-libtheora --disable-iconv --enable-libfreetype --enable-fontconfig --disable-libopenjpeg --disable-libx264 --disable-libx265 --disable-libdav1d --disable-x86asm --disable-mmx --disable-sse --disable-sse2 --disable-sse3 --disable-ssse3 --disable-sse4 --disable-sse42 --disable-avx --disable-avx2 --disable-armv6 --disable-armv6t2 --disable-vfp --disable-neon --disable-altivec --extra-libs=-latomic --enable-pic --cpu="arch12"  )
ERROR: libopencv not found

If you think configure made a mistake, make sure you are using the latest
version from Git.  If the latest version fails, report the problem to the
ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.libera.chat.
Include the log file "ffbuild/config.log" produced by configure as this will help
solve the problem.
make: *** [package/pkg-generic.mk:279: /home/buildroot/instance-0/output-1/build/ffmpeg-6.1.2/.stamp_configured] Error 1
make: Leaving directory '/home/buildroot/instance-0/buildroot'