title: Installing OPENCV with cmake failing. Python.h
body: <p>When i try to <code>make</code> in opencv/build/ as this guide tells me: <a href="https://intelligentbee.com/2015/11/18/build-a-face-detector-on-os-x-using-opencv-and-c/" rel="nofollow noreferrer">https://intelligentbee.com/2015/11/18/build-a-face-detector-on-os-x-using-opencv-and-c/</a></p>
  
  <pre><code>/Users/oscarlajgaard/opencv-3.3.1/modules/python/src2/cv2.cpp:6:10: fatal error: 
        'Python.h' file not found
  #include &lt;Python.h&gt;
           ^~~~~~~~~~
  </code></pre>
  
  <p>CMAKE Config PYTHON3</p>
  
  <p>PYTHON3_EXECUTABLE = /usr/local/bin/python3</p>
  
  <p>PYTHON3_INCLUDE_DIR = /usr/local/Cellar/python/3.7.0/Frameworks/Python.framework/Versions/3.7/include/python3.7m/</p>
  
  <p>PYTHON3_LIBRARY = /usr/local/Cellar/python/3.7.0/Frameworks/Python.framework/Versions/3.7/lib/libpython3.7.dylib</p>