gcc-arm-10.2-2020.11-x86_64-arm-none-linux-gnueabihf.tar.xz
OpenCV 4.4.0 + OpenCV's extra modules 4.4.0
cmake -DCMAKE_TOOLCHAIN_FILE=../arm-gnueabi.toolchain.cmake -DOPENCV_EXTRA_MODULES_PATH=<PATH TO opencv_contrib/modules> -DBUILD_LIST=tracking,imgcodecs,videoio,highgui,features2d,ml,xfeatures2d -DCMAKE_BUILD_TYPE=Release ../../..
NCNN
cmake -DCMAKE_TOOLCHAIN_FILE=../toolchains/arm-linux-gnueabihf.toolchain.cmake -DCMAKE_BUILD_TYPE=Release -DNCNN_VULKAN=OFF -DNCNN_BUILD_EXAMPLES=ON ..
ZBAR
./configure --prefix=$(pwd)/build --host=arm-none-linux-gnueabihf --enable-shared --without-gtk --without-python --without-qt --without-imagemagick --disable-video CC=arm-none-linux-gnueabihf-gcc CXX=arm-none-linux-gnueabihf-g++