title: Rails - Can't install RMagick 2.16.0. Can't find MagickWand.h
body: <p>I appreciate this question has been asked many times before, however I've tried all available answers to no avail. The error log is as follows:</p>
  
  <pre><code>have_header: checking for wand/MagickWand.h... -------------------- no
  
  "gcc -E -I/Users/mark/.rvm/rubies/ruby-2.3.3/include/ruby-2.3.0/x86_64-darwin16 -I/Users/mark/.rvm/rubies/ruby-2.3.3/include/ruby-2.3.0/ruby/backward -I/Users/mark/.rvm/rubies/ruby-2.3.3/include/ruby-2.3.0 -I.  -DMAGICKCORE_HDRI_ENABLE=1 -DMAGICKCORE_QUANTUM_DEPTH=16 -DMAGICKCORE_HDRI_ENABLE=1 -DMAGICKCORE_QUANTUM_DEPTH=16 -I/usr/local/Cellar/imagemagick/7.0.4-8/include/ImageMagick-7  -DMAGICKCORE_HDRI_ENABLE=1 -DMAGICKCORE_QUANTUM_DEPTH=16 -DMAGICKCORE_HDRI_ENABLE=1 -DMAGICKCORE_QUANTUM_DEPTH=16 -I/usr/local/Cellar/imagemagick/7.0.4-8/include/ImageMagick-7  conftest.c -o conftest.i"
  conftest.c:3:10: fatal error: 'wand/MagickWand.h' file not found
  #include &lt;wand/MagickWand.h&gt;
       ^
  1 error generated.
  checked program was:
  /* begin */
  1: #include "ruby.h"
  2: 
  3: #include &lt;wand/MagickWand.h&gt;
  /* end */
  </code></pre>
  
  <p>After running mdfind MagickWand.h I can see the path is:</p>
  
  <pre><code>/usr/local/Cellar/imagemagick/7.0.4-8/include/ImageMagick-7/MagickWand/MagickWand.h
  </code></pre>
  
  <p>I then run:</p>
  
  <pre><code>C_INCLUDE_PATH=/usr/local/Cellar/imagemagick/7.0.4-8/include/ImageMagick-7/MagickWand/ gem install rmagick
  </code></pre>
  
  <p>However get the same message as before. </p>
  
  <p>Any help for how to get this solved is greatly appreciated.</p>