No module named 'skbuild' for pip 21.1.2

[devm21]

Expected behaviour

this happens on python setup.py bdist_wheel

Actual behaviour

Error: ModuleNotFoundError: No module named 'skbuild'

Steps to reproduce

cloned open-cv python
cd into open-cv python
run python setup.py bdist_wheel

Suggested solution on README is pip install --upgrade pip, but it does not work in pip version 21

[skvark]

You must run pip wheel . --verbose. The command you used does not use pip and is not recommended as explained in the README. pyproject.toml defines the build-time dependencies which are used by pip and only pip.

If you need to use the python setup.py bdist_wheel command, then install the dependencies manually: https://github.com/opencv/opencv-python#manual-debug-builds

[devm21]

i see, i was reading off #126 (comment)

is python setup.py bdist_wheel simply not recommended now?
I fixed the issue by reinstalled opencv-python + recompile opencv, but was wondering if there is a way to do that through pip like pip install opencv-contrib-python-non-free or some pre-built wheels for non-free opencv libs.

[skvark]

Yeah, that's an old comment. However, it still works if you install scikit-build and numpy before running it.

Manual local build (by cloning this repository and submodules):

1. git clone --recursive https://github.com/opencv/opencv-python.git
2. cd opencv-python
3. pip install scikit-build numpy
4. export CMAKE_ARGS="-DOPENCV_ENABLE_NONFREE=ON"
5. python setup.py bdist_wheel

Manual build with pip from PyPI source tarballs (the easiest way, as documented in the README):

1. export CMAKE_ARGS="-DOPENCV_ENABLE_NONFREE=ON"
2. pip install --no-binary opencv-python opencv-python

[skvark]

I fixed the issue by reinstalled opencv-python + recompile opencv, but was wondering if there is a way to do that through pip like pip install opencv-contrib-python-non-free or some pre-built wheels for non-free opencv libs.

It's not legal to redistribute commercial / patented algorithms as pre-built binaries so there are no such packages available. This is explained in the FAQ in the README as well as in the issue you linked.

[devm21]

@skvark all good, closing the issue. thanks for the explanations.