在opencv3.2.0下新建文件夹 aarch_64_install和build，进入build，执行
cmake .. \
-DCMAKE_INSTALL_PREFIX=/home/Apple/Lib/opencv_4.5.5_Arm8.3 \
-DCMAKE_INSTALL_INCLUDEDIR=/home/Apple/Lib/opencv_4.5.5_Arm8.3/include \
-DCMAKE_TOOLCHAIN_FILE=/home/Apple/Lib/opencv-4.5.5/platforms/x86_arm/arm_linux_gnueabihf_8.3.cmake \
-DCMAKE_BUILD_TYPE=Release


CMAKE_INSTALL_PREFIX 指定编译文件make install后保存路径
CMAKE_TOOLCHAIN_FILE 指定编译工具链，没有可以自己创建一个.cmake


make -8

make install


编译libevent
cmake .. \
-DCMAKE_INSTALL_PREFIX=/home/Apple/Lib/libevent
#-DCMAKE_INSTALL_INCLUDEDIR=/home/Apple/Lib/libevent/include \