stylus not working

gistfile1.coffee

app = express.createServer()

viewdir = __dirname + '/views'
staticdir = __dirname + '/static'

app.configure ->
	
	app.use express.errorHandler({ dumpExceptions: true, showStack: true })
	app.use express.logger()
	app.use express.bodyParser()

	app.set 'views', viewdir
	app.set 'view engine', 'jade'

	app.use '/css', stylus.middleware {
		src: viewdir
		dest: cssdir
		debug: true
		compile: (str, path)->
			console.log 'Stylus', str, path
			stylus(str)
				.set('filename', path)
				.set('warn', true)
				.set('compress', true)
	}
	
	app.use '/css', express.static(cssdir)
	app.use '/static', express.static(staticdir)