I got bit by the switch from Ruby to Node.js. The Node.js arrangement was considerably more difficult to set up on the older systems we maintain. Most annoyingly lesscss.org makes no mention of the switch away from Ruby. Our plan right now is to abandon less-css and just check the converted CSS into our repo - the (server setup complexity) costs far outweighed the benefits.
[edit] Well I guess the old repo did mention the switch :\ https://github.com/cloudhead/less still frustrating