`less` is not a python dependency, is is a javascript module run by [node](http://nodejs.org/) (a javascript server), `lessc` is the command line tool compiler that you can usually install with node package manage (aka `npm`), but depending on your system how to install `lessc` can vary. on debian e.g it is `apt-get install less-js` IIRC.

If this start to be too far from the stack you are used to, we can compile the css ourselves and send the compile file to you, just ask.