Apple seems to have decided to ship MacRuby as a private Framework in their new OS (Lion), meaning that OS X developers can't link to it, even tho it ships with the OS. If you would like to not have to embed MacRuby, please take a minute to file a ticket as suggested in the post.

Blog post: http://merbist.com/2011/03/07/hey-apple-please-be-nice-and-share/

- Matt