how to configure less with the stealconfig?

With the new Stealjs 0.2.2 how do I configure less? Is this the correct ext.less property? Do I need to make further additions to the stealconfig?

ext: {
            less: "bower_components/steal/less",
            ejs: "can/view/ejs/system",
            mustache: "can/view/mustache/system",
            stache: "can/view/stache/system"
        }



I'm using bower with these versions of canjs and steal.

 "dependencies": {
    "canjs": "git://github.com/bitovi/canjs.git#017d8aed847dc69e7abaae1bd3edb274c13cb89d",
    "jquery": "~2.1.1",
    "steal": "0.2.2"
  }