title: How to use numpy with OpenBLAS instead of Atlas in Ubuntu?
body: <p>I have looked for an easy way to install/compile Numpy with OpenBLAS but didn't find an easy answer. All the documentation I have seen takes too much knowledge as granted for someone like me who is not used to compile software.
  There are two packages in Ubuntu related to OpenBLAS : <code>libopenblas-base</code> and <code>libopenblas-dev</code>.
  Once they are installed, what should I do to install Numpy again with them?
  Thanks!</p>
  
  <p>Note that when these OpenBLAS packages are installed, Numpy doesn't work anymore: it can't be imported: ImportError: /usr/lib/liblapack.so.3gf: undefined symbol: ATL_chemv.
  The problem occurs as well when installing Theano with their <a href="http://deeplearning.net/software/theano/install_ubuntu.html#install-ubuntu" rel="nofollow noreferrer">website instructions</a> for Ubuntu.</p>
  
  <p>This was noticed <a href="https://stackoverflow.com/questions/8917977/installing-lapack-for-numpy">here</a> already.</p>