title: How to install scikit-learn on heroku cedar?
body: <p>I'v successfully installed numpy and scipy using the method described in <a href="https://stackoverflow.com/a/10632272/986743">this</a> answer. Then I wanted to add scikit-learn so at first I tried adding <code>scikit-learn==0.11</code> to the requirements.txt and when pushed to heroku I got an error message:</p>
  
  <pre><code>ImportError: liblapack.so.3gf: cannot open shared object file: No such file or directory
  </code></pre>
  
  <p>So I've added to <code>LD_LIBRARY_PATH</code> the path where I have <code>liblapack.so.3gf</code> but then I got this:</p>
  
  <pre><code>ImportError: libgfortran.so.3: cannot open shared object file: No such file or directory
  </code></pre>
  
  <p>I believe that heroku doesn't have fortran compiler, but maybe I wrong. How can I resolve this?</p>