title: How to install Numpy without compiling the sources
body: <p>I have a project running on CentOS7 that uses Numpy. 
  The problem is that it takes a very huge amount of time to install this dependency.</p>
  
  <p>I therefore tried to <code>yum install</code> numpy libs before <code>pip install</code> it.</p>
  
  <p>So I run:</p>
  
  <pre><code>yum install numpy-1.7.1
  pip install numpy==1.7.1   # This pip is executed in a virtualenv
  </code></pre>
  
  <p>The <code>yum install</code> installs the packaged library, and is quite fast to be performed.
  The weird thing is that the <code>pip install</code> command re-compile all the sources. This is strange because, from my understanding, the <code>pip install</code> shall only add the python bindings on the compiled lib previously installed.</p>
  
  <p>Any idea to get this library installed without to have everything recompiled?</p>