title: How Symfony2 know where are sass and compass installed?
body: <p>I have installed Sass, and Compass using:</p>
  
  <pre><code>gem install sass
  gem install compass
  </code></pre>
  
  <p>And now I'm trying to integrate Sass, Compass with Assetic on symfony2. But what I don't understand is <em>How Symfony2 does to find the Sass and Compass instalations on my system (Windows 8)</em> ?</p>