What is the easiest way to install BLAS and LAPACK for scipy?

Question

I would like to run a programme that someone else has prepared and it includes scipy. I have tried to install scipy with

pip install scipy

Answer 1

For Debian Jessie and Stretch installing the following packages resolves the issue:

sudo apt install libblas3 liblapack3 liblapack-dev libblas-dev

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Your next issue is very likely going to be a missing Fortran compiler, resolve this by installing it like this:

sudo apt install gfortran

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If you want an optimized scipy, you can also install the optional libatlas-base-dev package:

sudo apt install libatlas-base-dev

Source

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If you have any issue with a missing Python.h file like this:

Python.h: No such file or directory

Then have a look at this post: https://stackoverflow.com/a/21530768/209532