title: fatal error: 'Python.h' file not found while installing opencv
body: <p>I am trying to get opencv 3.1 installed for Python on my Mac OS X 10.10.5
  I'm following the steps as outlined here - <a href="http://www.pyimagesearch.com/2015/06/15/install-opencv-3-0-and-python-2-7-on-osx/">http://www.pyimagesearch.com/2015/06/15/install-opencv-3-0-and-python-2-7-on-osx/</a></p>
  
  <p>When I actually try installing opencv after all the setup, I get the following error: </p>
  
  <pre><code>.../opencv/modules/python/src2/cv2.cpp:6:10: fatal error: 
    'Python.h' file not found
   #include &lt;Python.h&gt;
            ^
  </code></pre>
  
  <p>I looked around StackOverflow and found that most people facing this issue are using Anaconda, which is not my case. It would be great if someone could point me in the right direction to get this fixed. </p>
  
  <p>Thanks,</p>