Hi, I have included library libffmpeg-audio-dec in my code base through kernel configuration file. I am cross compiling my code for openwrt. The error message is: cd /home/taruna/GRX_350/UGW-7.1.1/UGW-7.1.1-SW-CD/Sources/UGW-7.1.1/build_dir/target-mips_mips32_uClibc-0.9.33.2_grx350_1600_mr_vdsl_lte_sec_gw_711/ffmpeg-audio-dec/ffmpeg-2.6.2; CFLAGS="-Os -pipe -mips32r2 -mtune=1004kc -fno-caller-saves -fhonour-copts -fno-caller-saves -fhonour-copts -Wno-error=unused-but-set-variable -msoft-float -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2 -Wl,-z,now -Wl,-z,relro -I/home/taruna/GRX_350/UGW-7.1.1/UGW-7.1.1-SW-CD/Sources/UGW-7.1.1/staging_dir/target-mips_mips32_uClibc-0.9.33.2_grx350_1600_mr_vdsl_lte_sec_gw_711/usr/include -I/home/taruna/GRX_350/UGW-7.1.1/UGW-7.1.1-SW-CD/Sources/UGW-7.1.1/staging_dir/target-mips_mips32_uClibc-0.9.33.2_grx350_1600_mr_vdsl_lte_sec_gw_711/include -I/home/taruna/GRX_350/UGW-7.1.1/UGW-7.1.1-SW-CD/Sources/UGW-7.1.1/staging_dir/toolchain-mips_mips32_gcc-4.8-linaro_uClibc-0.9.33.2/usr/include -I/home/taruna/GRX_350/UGW-7.1.1/UGW-7.1.1-SW-CD/Sources/UGW-7.1.1/staging_dir/toolchain-mips_mips32_gcc-4.8-linaro_uClibc-0.9.33.2/include -fpic" LDFLAGS="-L/home/taruna/GRX_350/UGW-7.1.1/UGW-7.1.1-SW-CD/Sources/UGW-7.1.1/staging_dir/target-mips_mips32_uClibc-0.9.33.2_grx350_1600_mr_vdsl_lte_sec_gw_711/usr/lib -L/home/taruna/GRX_350/UGW-7.1.1/UGW-7.1.1-SW-CD/Sources/UGW-7.1.1/staging_dir/target-mips_mips32_uClibc-0.9.33.2_grx350_1600_mr_vdsl_lte_sec_gw_711/lib -L/home/taruna/GRX_350/UGW-7.1.1/UGW-7.1.1-SW-CD/Sources/UGW-7.1.1/staging_dir/toolchain-mips_mips32_gcc-4.8-linaro_uClibc-0.9.33.2/usr/lib -L/home/taruna/GRX_350/UGW-7.1.1/UGW-7.1.1-SW-CD/Sources/UGW-7.1.1/staging_dir/toolchain-mips_mips32_gcc-4.8-linaro_uClibc-0.9.33.2/lib" ./configure --enable-cross-compile --cross-prefix="mips-openwrt-linux-uclibc-" --arch="mips" --target-os=linux --prefix="/usr" --pkg-config="pkg-config" --enable-shared --enable-static --enable-small --enable-pthreads --enable-zlib --disable-runtime-cpudetect --disable-doc --disable-debug --enable-gpl --enable-version3 --disable-altivec --disable-amd3dnow --disable-amd3dnowext --disable-mmx --disable-mmxext --disable-sse --disable-sse2 --disable-sse3 --disable-ssse3 --disable-sse4 --disable-sse42 --disable-avx --disable-xop --disable-fma3 --disable-fma4 --disable-avx2 --disable-vfp --disable-neon --disable-inline-asm --disable-yasm --disable-mips32r2 --disable-mipsdspr1 --disable-mipsdspr2 --disable-mipsfpu --disable-dxva2 --disable-lzma --disable-vaapi --disable-vda --disable-vdpau --disable-outdevs --disable-programs --disable-avfilter --disable-postproc --disable-swresample --disable-swscale --disable-everything --enable-decoder="aac" --enable-decoder="aac_latm" --enable-decoder="ac3" --enable-decoder="adpcm_*" --enable-decoder="alac" --enable-decoder="amrnb" --enable-decoder="amrwb" --enable-decoder="ape" --enable-decoder="atrac3" --enable-decoder="flac" --enable-decoder="mp2" --enable-decoder="mp3*" --enable-decoder="mpc7" --enable-decoder="mpc8" --enable-decoder="pcm_*" --enable-decoder="vorbis" --enable-decoder="wavpack" --enable-decoder="wmav1" --enable-decoder="wmav2" --enable-decoder="wmalossless" --enable-decoder="wmapro" --enable-decoder="zlib" --enable-demuxer="aac" --enable-demuxer="ac3" --enable-demuxer="aiff" --enable-demuxer="amr" --enable-demuxer="ape" --enable-demuxer="avi" --enable-demuxer="flac" --enable-demuxer="ffm" --enable-demuxer="matroska" --enable-demuxer="mp3" --enable-demuxer="mov" --enable-demuxer="mpc" --enable-demuxer="mpc8" --enable-demuxer="mpegts" --enable-demuxer="ogg" --enable-demuxer="rm" --enable-demuxer="rtsp" --enable-demuxer="rtp" --enable-demuxer="sdp" --enable-demuxer="wav" --enable-demuxer="wv" --enable-parser="aac" --enable-parser="aac_latm" --enable-parser="flac" --enable-parser="ac3" --enable-parser="mpegaudio" --enable-protocol="file" --enable-protocol="http" --enable-protocol="icecast" --enable-protocol="rtp" --enable-protocol="tcp" --enable-protocol="udp" --enable-libopus --enable-decoder=libopus --enable-libspeex --enable-decoder=libspeex --disable-decoder=pcm_bluray,pcm_dvd ) ERROR: opus 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 "config.log" produced by configure as this will help solve the problem. I have attached "config.log" file along with this mail. I have tried to recompile the package by enabling "opus" package in the kernel but still, I am facing the same issue. I have also tried to replace the existing "ffmpeg" package (ver. 2.6.2) with the latest version (ver. 3.2.4, downloaded from https://ffmpeg.org/download.html <https://ffmpeg.org/download.html> ), but this too doesn't solve the compilation issue. Can you please help in resolving this issue? Regards, Taruna