by lexi-lambda

GitHub Readme.md


This is a custom Heroku buildpack for building and deploying Racket applications on Heroku.

To use this custom buildpack, use the Heroku toolbelt's buildpacks:set command:

$ heroku buildpacks:set https://github.com/lexi-lambda/heroku-buildpack-racket

When the application is next deployed, the new buildpack will be used.


The Racket buildpack requires that the RACKET_VERSION environment variable be set in order to decide what version of Racket to use. It may either be set to a specific version (such as 6.2) or to either current or HEAD, which will use nightly, bleeding-edge snapshots.

By default, the buildpack will use the full Racket distribution. If you want to only install a minimal Racket distribution, append -minimal to the end of the version string (e.g. 6.2-minimal or HEAD-minimal).

To configure environment variables for your Heroku application, either use the web interface, or use the heroku config:set command.


The Racket buildpack will install your repository as a package, so it must include an info.rkt file in the root. Once installed, it will be moved to the app/ directory. It is recommended that you specify your application entry point via the racket executable's -l flag so you can pass a module path instead of a file path, which will work no matter what the filesystem layout.

For example, if your package contained a file called server.rkt in a collection called my-app, the Procfile entry to start your application might look like this:

web: racket -l my-app/server