If you are doing a lot of theming in Drupal with Sass and Compass, there's a good chance your stylesheets rely on specific versions of gems to compile properly. Mixins and functions can change, and sometimes gems rely on specific versions of other gems to work properly.
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Looking to write CSS for your Drupal sites faster and easier, and eliminate common defects? The first step probably involves choosing a CSS preprocessor to make your stylesheets programmable and accelerate the production of code. There are several out there which are widely supported, but the ones we really like to use are SASS and Compass. This article explains how to set up these tools for use within Drupal.