Pillow/wheels/README.md

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README
------
[cibuildwheel](https://github.com/pypa/cibuildwheel) is used to build macOS and Linux
wheels for tagged versions of Pillow.
This directory contains [multibuild](https://github.com/multi-build/multibuild) to
build dependencies for the wheels, and dependency licenses to be included.
Archives
--------
https://github.com/python-pillow/pillow-depends contains archives for libraries
that will be built as part of the Pillow build.
In general, there is no need to put library archives there, because the
`multibuild` scripts will download them from their respective URLs.
But, the build will look in that repository before downloading from the
URL, so if there is a library that often fails to download, or you think might
fail to download, then download it and add it to the Git repository.
See `build` in `.github/workflows/wheels-dependencies.sh` and the `fetch_unpack`
routine in `multibuild/common_utils.sh` for the logic, and the build recipes in
`multibuild/library_builders.sh` for the filename to give to the downloaded
archive.
Wheels
------
Wheels are
[GitHub Actions artifacts created for tags, relevant changes or manual builds](https://github.com/python-pillow/Pillow/actions/workflows/wheels.yml).
Windows wheels are created separately. They are
[GitHub Actions artifacts created on each run of the Windows workflow](https://github.com/python-pillow/Pillow/actions/workflows/test-windows.yml?query=branch%3Amain).