By default this buildpack downloads custom luvit version based on bundled luvit 0.6.1 with integrated libuv-0.10.12.
For instance, creation of simple luvit app from test:
$ heroku create heroku-buildpack-luvit --buildpack https://github.com/norefle/heroku-buildpack-luvit.git
$ git push heroku master
$ ... git output ...
$ -----> Fetching custom git buildpack... done
$ -----> luvit app detected
$ -----> Fetching luvit.
$ -----> luvit v0.6.1 was configured successfully.
$ -----> Discovering process types
$ Procfile declares types -> web
$
$ -----> Compiled slug size: 1.2Mb
$ -----> Launching... done, v6
$ http://heroku-buildpack-luvit.herokuapp.com deployed to Heroku
Result you can find here: heroku-buildpack-luvit.herokuapp.com.