How to switch between the various BLAS/LAPACK implementations
=============================================================

BLAS:
$ sudo update-alternatives --config libblas.so.3

LAPACK:
$ sudo update-alternatives --config liblapack.so.3

More information is available at:

 http://wiki.debian.org/DebianScience/LinearAlgebraLibraries


Building an optimized OpenBLAS packages on your architecture
============================================================

Note that libopenblas-base provides a multiple architecture library. All
kernels are included in the library and the one matching your architecture is
selected at run time.

If you nevertheless want to create a custom OpenBLAS package, optimized only
for your specific machine, proceeds as follows.

Install the build dependencies:

$ sudo aptitude build-dep openblas
$ sudo aptitude install devscripts

Get the sources of the package:

$ apt-get source openblas

Compile the package:

$ cd openblas-<VERSION>
$ fakeroot debian/rules custom

It should produce a package that you can install with:

$ sudo dpkg -i ../libopenblas-base_<DEBVERSION>.deb

 -- Sébastien Villemot <sebastien@debian.org>, Tue,  5 Aug 2014 16:52:28 +0200
 -- Sylvestre Ledru <sylvestre@debian.org>  Tue, 31 May 2011 13:56:22 +0200