With Chef 11 Server, the CouchDB component is removed for PostgreSQL. RabbitMQ is still there. Opscode provides a single package with everything above libc required to run the server.

http://www.opscode.com/chef/install - "Chef Server" tab.

If you'd like to build your own:

https://github.com/opscode/omnibus-chef https://github.com/opscode/omnibus-software https://github.com/opscode/omnibus-ruby

Cheers, Joshua Timberman, Technical Program Manager, Opscode, Inc.