Install opencv on mac os, with fish shell, virtualfish (vf)

gistfile1.txt

cmake -D CMAKE_BUILD_TYPE=RELEASE \
-D CMAKE_INSTALL_PREFIX=/usr/local/ \
-D OPENCV_EXTRA_MODULES_PATH=~/Development/opencv_contrib-4.1.1/modules \
-D PYTHON3_LIBRARY=(python -c 'import subprocess ; import sys ; s = subprocess.check_output("python-config --configdir", shell=True).decode("utf-8").strip() ; (M, m) = sys.version_info[:2] ; print("{}/libpython{}.{}.dylib".format(s, M, m))') \
-D PYTHON3_INCLUDE_DIR=(python -c 'import distutils.sysconfig as s; print(s.get_python_inc())') \
-D PYTHON3_EXECUTABLE=(which python) \
-D BUILD_opencv_python2=OFF \
-D BUILD_opencv_python3=ON \
-D INSTALL_PYTHON_EXAMPLES=ON \
-D INSTALL_C_EXAMPLES=OFF \
-D OPENCV_ENABLE_NONFREE=ON \
-D BUILD_EXAMPLES=ON