Supplying NumPy site.cfg arguments to pip

Question

I\'m using NumPy built against Intel\'s Math Kernel Library. I use virtualenv, and typically use pip to install packages.

However, in order for NumPy to find the

Answer 1

To your question of how to configure NumPy (e.g. to use OpenBLAS):

1. Download https://github.com/numpy/numpy/blob/master/site.cfg.example
2. Edit the relevant lines, e.g.

[openblas]
libraries = openblas
library_dirs = /opt/OpenBLAS/lib
include_dirs = /opt/OpenBLAS/include

3. Save it as ~/.numpy-site.cfg

4. Install numpy from source without manually downloading it (--force-reinstall will let it replace an existing package):

   pip install numpy --no-binary numpy --force-reinstall

5. Bonus: The same file ~/.numpy-site.cfg works for installing scipy on the OpenBLAS:

   pip install scipy --no-binary scipy

   or install them together:

   pip install numpy scipy --no-binary numpy,scipy --force-reinstall

Sept. 2019: If you're still using Python 2.7, install numpy then install scipy. Attempting to install them together will:

• invoke a SciPy easy_install installer that requests NumPy,
• load the latest NumPy installer (even if you specifically asked pip to install numpy==1.14.6 scipy==1.0.1 --no-binary numpy,scipy), then
• fail with RuntimeError: Python version >= 3.5 required because the latest NumPy does not support Python 2.7.