title: Caffe compilation error on Ubuntu 16.04
body: <p>I think I pretty much followed all the instructions in:
  <a href="https://github.com/BVLC/caffe/wiki/Ubuntu-16.04-or-15.10-Installation-Guide" rel="nofollow noreferrer">https://github.com/BVLC/caffe/wiki/Ubuntu-16.04-or-15.10-Installation-Guide</a>.</p>
  
  <p>I still get the error:</p>
  
  <pre><code>/usr/bin/ld: cannot find -lopenblas
  collect2: error: ld returned 1 exit status
  Makefile:567: recipe for target '.build_release/lib/libcaffe.so.1.0.0-rc3' failed
  make: *** [.build_release/lib/libcaffe.so.1.0.0-rc3] Error
  </code></pre>
  
  <p>Has anyone come across this?</p>