I am actually working on a little side project with my friend Thomas Debarochez. We are using Play!Framework and Compass and we deploy it to Heroku.

One issue that came when we first deployed the application with Compass to Heroku was that the default scala buildpack does not include sass and compass binaries.

Following this post on the Play!Framework mailing list, I forked and patched the buildpack to install sass and compass on the environment.

You can find it here and use it with the following command :

heroku config:set BUILDPACK_URL=https://github.com/CedricGatay/heroku-buildpack-scala

I hope someone will find this useful !