Compile LESS files to CSS
If you don't want to wait for the port of the Less CSS Preprocessor module to run the less compiler at run time, you can execute the command line tool from settings.php

exec('lessc themes/mytheme/less/style.less themes/mytheme/css/style.css &gt; /tmp/less-debug 2&gt;&amp;1');


This is only for development, remove this from the production settings.php.