title: gensim on EC2: installation issue
body: <p>I am trying to install gensim on EC2 (RedHat - t2-micro) to build a REST API. The overall installation process is really long so I shorten the code to replicate the error I am getting. Here below the shorter version:</p>
  
  <ul>
  <li><p>sudo yum update -y (EC2 update)</p></li>
  <li><p>sudo yum install nano (nano editor)</p></li>
  <li>sudo yum -y install gcc-c++ python27-devel atlas-sse3-devel lapack-devel (various Gensim related packages)</li>
  <li>sudo yum -y install httpd (Apache)</li>
  <li>sudo yum install mod_wsgi (WSGI)</li>
  <li>curl -O <a href="https://bootstrap.pypa.io/get-pip.py" rel="nofollow noreferrer">https://bootstrap.pypa.io/get-pip.py</a> then sudo python2.7 get-pip.py (PIP)</li>
  <li>virtualenv -p python2.7 /tmp/my_app then . /tmp/my_app/bin/activate (virtual env)</li>
  </ul>
  
  <p>With my virtual env setup, I then added numpy, scipy, and gensim:
  - pip install -U --force numpy
  - pip install -U --force scipy
  - pip install -U --force </p>
  
  <p>Now if I add a simple file with the following code:</p>
  
  <pre><code># -*- coding: utf-8 -*-
  
  import gensim
  
  def main():
      return "Hello my AVABBBCCCDDDEEE world!"
  
  if __name__ == "__main__":
      main()
  </code></pre>
  
  <p>and run "python file.py" in the terminal (MACOS), i get the following error:</p>
  
  <p>/tmp/ava_app/lib/python2.7/site-packages/gensim/utils.py:1015: UserWarning: Pattern library is not installed, lemmatization won't be available.
    warnings.warn("Pattern library is not installed, lemmatization won't be available.")
  No handlers could be found for logger "gensim.models.doc2vec"</p>
  
  <p>Any idea? The error results in a 500 error in the browser.</p>
  
  <p>Many thanks, Stephane</p>