title: How to check which BLAS is in my Ubuntu system?
body: <p>In particular, I would like to know if xianyi's OpenBLAS has been installed. 
  I work on several PCs and had it installed in several PCs over the past couple of years, but I lost track which were not installed with it. I need to know which PC has it and which doesn't This is how I installed it:  </p>
  
  <pre><code>git clone git://github.com/xianyi/OpenBLAS
  cd OpenBLAS
  make FC=gfortran
  sudo make PREFIX=/usr/local/ install
  </code></pre>
  
  <p>Note: I may have deleted the OpenBLAS directory, so it's not a reliable indicator. And I have no idea how to uninstall it, so I can't try installing it on every PC and then uninstall selectively (which is pretty cumbersome). </p>