How to compile less to css into another directory using node.js?

My directory /public/less contains all my less files.

How to configure node.js to compile those files to another directory? e.g /public/compiled-stylesheets

my default express configuration is:

app.configure(function () {
    app.set('views', __dirname + '/views');
    app.set('view engine', 'jade');
    app.use(express.bodyParser());
    app.use(express.methodOverride());
    app.use(express.compiler({ src:__dirname + '/public', enable:['less']}));
    app.use(app.router);
    app.use(express.static(__dirname + '/public'));
});