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Common Lisp Shell
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Heroku Buildpack for Common Lisp

A Buildpack that allows you to deploy Common Lisp applications on the Heroku infrastructure.

Original work by Mike Travers,


  • Support for SBCL and Hunchentoot.

Example app at

  • Implementation choice via env variables.

You need this first: It will allow the config vars to be present at build time.

Then you can do heroku config:add CL_IMPL=sbcl or heroku config:add CL_IMPL=ccl

  • Web server choice heroku config:add CL_WEBSERVER=hunchentoot or heroku config:add CL_WEBSERVER=aserve


  • To avoid trouble with SBCL source encoding use: heroku config:add LANG=en_US.UTF-8

  • Hunchentoot working with SBCL and CCL. AllegroServe working with CCL. There's however an issue with AllegroServe in SBCL. acl-compat bundled in seems to be using some SBCL deprecated sb-thread functions.

José Santos,

I've kept the original readme for reference.



  • The scripts bin/test-compile and bin/test-run simulate as far as possible the Heroku build and run environments on your local machine.
  • Heroku does not have a persistent file system. Applications should use S3 for storage; ZS3 is a useful CL library for doing that.


  • parameterizing/forking for other Lisp implementations and web servers (see Github forks)
  • support for Heroku's database infrastructure (DONE -- see the example application).


Mike Travers,