Would someone please answer installation questions about NumPy's BLAS on macOS? I'm not finding the answers in the release notes <https://github.com/numpy/numpy/releases>, the PR <https://github.com/numpy/numpy/pull/18874> source, the docs <https://numpy.org/doc/1.21/>, or Stack Overflow <https://stackoverflow.com/search?tab=newest&q=%5bnumpy%5d%20openblas>.
Q1. The NumPy 1.21.0 release note <https://github.com/numpy/numpy/releases/tag/v1.21.0> says "This change enables the Accelerate Framework as an option on macOS." How to set that option on/off? Q2. How to determine if NumPy uses Accelerate vs. its internal copy of OpenBLAS? After installing a wheel, `numpy.show_config()` shows the openblas_info library_dirs et al as '/usr/local/lib'. Neither '/usr/local/lib/' nor 'site-packages/numpy/' contains a *blas*.so library (for Python 3.8.* on macOS 10.14.6) but the doc <https://numpy.org/install/> says "The OpenBLAS libraries are included in the wheel." Q3. How to pip install NumPy 1.21.0 in a way that ensures it uses its embedded OpenBLAS on macOS as on Linux? I'm aiming for as portable results as possible. Or should we link NumPy to an external OpenBLAS via `pip install numpy --no-binary numpy==1.21.0` with `~/.numpy-site.cfg`? (Ditto for SciPy.) Q4. Can the new NPY_* environment variables select specific BLAS & LAPACK libraries through pip install, and perhaps install faster than building NumPy, SciPy, etc. from source? How to do that? Q5. Is NumPy's embedded OpenBLAS compiled by gcc or clang? Is that controllable via `pip install`? Thank you!
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