title: Error installing compass. Failed to build gem native extension (Compass)
body: <p>After installation of SASS, i did :</p>
  
  <pre><code>gem install compass
  </code></pre>
  
  <p>And this error appears.</p>
  
  <pre><code>Building native extensions.  This could take a while...
  ERROR:  Error installing compass:
  ERROR: Failed to build gem native extension.
  
  /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby -r ./siteconf20140818-5119-rfb64z.rb extconf.rb
  mkmf.rb can't find header files for ruby at /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/include/ruby.h
  
  extconf failed, exit code 1
  
  Gem files will remain installed in /Library/Ruby/Gems/2.0.0/gems/ffi-1.9.3 for inspection.
  Results logged to /Library/Ruby/Gems/2.0.0/extensions/universal-darwin-13/2.0.0/ffi-1.9.3/gem_make.out
  </code></pre>
  
  <p>Do you have a solution ?</p>