>>> ffmpeg 4.2.2 Extracting
xzcat /data/buildroot/buildroot-test/instance-0/dl/ffmpeg/ffmpeg-4.2.2.tar.xz | /data/buildroot/buildroot-test/instance-0/output/host/bin/tar --strip-components=1 -C /data/buildroot/buildroot-test/instance-0/output/build/ffmpeg-4.2.2   -xf -
>>> ffmpeg 4.2.2 Patching
>>> ffmpeg 4.2.2 Updating config.sub and config.guess
for file in config.guess config.sub; do for i in $(find /data/buildroot/buildroot-test/instance-0/output/build/ffmpeg-4.2.2 -name $file); do cp support/gnuconfig/$file $i; done; done
>>> ffmpeg 4.2.2 Patching libtool
>>> ffmpeg 4.2.2 Configuring
(cd /data/buildroot/buildroot-test/instance-0/output/build/ffmpeg-4.2.2/ && rm -rf config.cache && PATH="/data/buildroot/buildroot-test/instance-0/output/host/bin:/data/buildroot/buildroot-test/instance-0/output/host/sbin:/data/buildroot/buildroot-test/venv/bin:/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl" AR="/data/buildroot/buildroot-test/instance-0/output/host/bin/mipsel-linux-ar" AS="/data/buildroot/buildroot-test/instance-0/output/host/bin/mipsel-linux-as" LD="/data/buildroot/buildroot-test/instance-0/output/host/bin/mipsel-linux-ld" NM="/data/buildroot/buildroot-test/instance-0/output/host/bin/mipsel-linux-nm" CC="/data/buildroot/buildroot-test/instance-0/output/host/bin/mipsel-linux-gcc" GCC="/data/buildroot/buildroot-test/instance-0/output/host/bin/mipsel-linux-gcc" CPP="/data/buildroot/buildroot-test/instance-0/output/host/bin/mipsel-linux-cpp" CXX="/data/buildroot/buildroot-test/instance-0/output/host/bin/mipsel-linux-g++" FC="/data/buildroot/buildroot-test/instance-0/output/host/bin/mipsel-linux-gfortran" F77="/data/buildroot/buildroot-test/instance-0/output/host/bin/mipsel-linux-gfortran" RANLIB="/data/buildroot/buildroot-test/instance-0/output/host/bin/mipsel-linux-ranlib" READELF="/data/buildroot/buildroot-test/instance-0/output/host/bin/mipsel-linux-readelf" STRIP="/data/buildroot/buildroot-test/instance-0/output/host/bin/mipsel-linux-strip" OBJCOPY="/data/buildroot/buildroot-test/instance-0/output/host/bin/mipsel-linux-objcopy" OBJDUMP="/data/buildroot/buildroot-test/instance-0/output/host/bin/mipsel-linux-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/data/buildroot/buildroot-test/instance-0/output/host/include" CFLAGS_FOR_BUILD="-O2 -I/data/buildroot/buildroot-test/instance-0/output/host/include" CXXFLAGS_FOR_BUILD="-O2 -I/data/buildroot/buildroot-test/instance-0/output/host/include" LDFLAGS_FOR_BUILD="-L/data/buildroot/buildroot-test/instance-0/output/host/lib -Wl,-rpath,/data/buildroot/buildroot-test/instance-0/output/host/lib" FCFLAGS_FOR_BUILD="" DEFAULT_ASSEMBLER="/data/buildroot/buildroot-test/instance-0/output/host/bin/mipsel-linux-as" DEFAULT_LINKER="/data/buildroot/buildroot-test/instance-0/output/host/bin/mipsel-linux-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  -O2  " CXXFLAGS="-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -O2  " LDFLAGS="" FCFLAGS=" -O2 " FFLAGS=" -O2 " PKG_CONFIG="/data/buildroot/buildroot-test/instance-0/output/host/bin/pkg-config" STAGING_DIR="/data/buildroot/buildroot-test/instance-0/output/host/mipsel-buildroot-linux-uclibc/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=no  SDL_CONFIG=/data/buildroot/buildroot-test/instance-0/output/host/mipsel-buildroot-linux-uclibc/sysroot/usr/bin/sdl2-config CFLAGS="-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -O2  " ./configure --enable-cross-compile --cross-prefix=/data/buildroot/buildroot-test/instance-0/output/host/bin/mipsel-linux- --sysroot=/data/buildroot/buildroot-test/instance-0/output/host/mipsel-buildroot-linux-uclibc/sysroot --host-cc="/usr/bin/gcc" --arch="mipsel" --target-os="linux" --disable-stripping --pkg-config="/data/buildroot/buildroot-test/instance-0/output/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 --enable-dct --enable-fft --enable-mdct --enable-rdft --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 --enable-gpl --disable-nonfree --disable-ffmpeg --enable-ffplay --disable-avresample --disable-ffprobe --disable-postproc --enable-swscale --disable-indevs --disable-outdevs --enable-pthreads --enable-zlib --enable-bzlib --disable-libfdk-aac --disable-libcdio --enable-gnutls --disable-openssl --enable-libdrm --disable-libopenh264 --disable-vaapi --disable-vdpau --disable-mmal --disable-omx --disable-omx-rpi --enable-libopencv --enable-libopus --disable-libvpx --disable-libass --enable-libbluray --disable-libmfx --disable-librtmp --disable-libmp3lame --enable-libmodplug --disable-libspeex --disable-libtheora --disable-libwavpack --disable-iconv --disable-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-mipsfpu --disable-altivec --extra-libs=-latomic --enable-pic --cpu=generic  )
ERROR: opencv not found using pkg-config

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.freenode.net.
Include the log file "ffbuild/config.log" produced by configure as this will help
solve the problem.
make: *** [package/pkg-generic.mk:259: /data/buildroot/buildroot-test/instance-0/output/build/ffmpeg-4.2.2/.stamp_configured] Error 1
make: Leaving directory '/data/buildroot/buildroot-test/instance-0/buildroot'