build python3 of opencv

build_opencv.sh

PYTHON3_ROOT=/home/acer/.pyenv/versions/3.7.4

# cmake -D CMAKE_BUILD_TYPE=RELEASE \
  # -D BUILD_NEW_PYTHON_SUPPORT=ON \
  # -D BUILD_opencv_python3=ON \
  # -D HAVE_opencv_python3=ON \
  # -D CMAKE_INSTALL_PREFIX=/home/acer/opencv_build \
  # -D PYTHON3_EXECUTABLE=/home/acer/.pyenv/versions/3.7.4/bin/python \
  # -D PYTHON_DEFAULT_EXECUTABLE=${PYTHON3_ROOT}/bin/python \
  # -D PYTHON3_INCLUDE_DIR=${PYTHON3_ROOT}/include/python3.7m \
  # -D PYTHON3_LIBRARIES=${PYTHON3_ROOT}/lib/libpython3.7m.so \
  # -D PYTHON3_NUMPY_INCLUDE_DIRS=$(python -c "import numpy; print(numpy.get_include())") \
  # -D PYTHON3_PACKAGES_PATH=$(python -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())") \
  # ..


#FIXME: pyenv won't work

cmake -D BUILD_NEW_PYTHON_SUPPORT=ON \
-D BUILD_opencv_python3=ON \
-D HAVE_opencv_python3=ON \
-D PYTHON_DEFAULT_EXECUTABLE=/usr/bin/python3 \
-D CMAKE_BUILD_TYPE=RELEASE \
-D CMAKE_INSTALL_PREFIX=/home/acer/opencv_build \
..