Fixing numpy.distutils.system_info.NotFoundError: No lapack/blas resources

Note: If you are on Windows, you can not install scipy using pip! Follow this guide instead: https://www.scipy.org/install.html. This blog post is only for Linux-based systems!

When building some of my libraries on Travis, I encountered this error during

install_numpy_scipy.sh
pip install numpy scipy --upgrade
numpy_error.txt
numpy.distutils.system_info.NotFoundError: No lapack/blas resources

Solution

Install lapack and blas:

install_lapack_blas.sh
sudo apt-get -y install liblapack-dev libblas-dev

In most cases you will then get this error message:

dfftpack_error.txt
error: library dfftpack has Fortran sources but no Fortran compiler found

Fix that by

install_gfortran.sh
sudo apt-get install -y gfortran

In Travis, you can do it like this in .travis.yml:

.travis.yml
before_install:
    - sudo apt-get -y install liblapack-dev libblas-dev gfortran

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