This is constructed with multiple tutorials online as well as opencv's issues
cmake -G Ninja -DCMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/usr/local -D OPENCV_EXTRA_MODULES_PATH=~/Development/opencv_contrib/modules -DPYTHON2_EXECUTABLE=$(which python2) -DPYTHON2_INCLUDE_DIR=$(python -c "from distutils.sysconfig import get_python_inc; print(get_python_inc())") -DPYTHON2_LIBRARY=$(python -c "import distutils.sysconfig as sysconfig; print(sysconfig.get_config_var('LIBDIR'))") -DPYTHON2_PACKAGES_PATH=$(python -c "import site; print(site.getsitepackages()[-1])") -DPYTHON3_EXECUTABLE=$(which python3) -DPYTHON3_INCLUDE_DIR=$(python3 -c "from distutils.sysconfig import get_python_inc; print(get_python_inc())") -DPYTHON3_LIBRARY=$(python3 -c "import distutils.sysconfig as sysconfig; print(sysconfig.get_config_var('LIBDIR'))") -DPYTHON3_PACKAGES_PATH=$(python3 -c "import site; print(site.getsitepackages()[-1])") -DBUILD_opencv_python2=on -DBUILD_opencv_python3=on -DPYTHON_LIBRARY=$(python3 -c "import distutils.sysconfig as sysconfig; print(sysconfig.get_config_var('LIBDIR'))") -DPYTHON_INCLUDE_DIRS=$(python3 -c "from distutils.sysconfig import get_python_inc; print(get_python_inc())") -DPYTHON_EXECUTABLE=$(which python3) ~/Development/opencv
This by default install for python3, for python2, change -DPYTHON_LIBRARY=$(python3 -c "import distutils.sysconfig as sysconfig; print(sysconfig.get_config_var('LIBDIR'))") -DPYTHON_INCLUDE_DIRS=$(python3 -c "from distutils.sysconfig import get_python_inc; print(get_python_inc())") -DPYTHON_EXECUTABLE=$(which python3) 's python3 to python