Writing apps for the iPhone in Scheme

My Scheme implementation of choice is Gambit Scheme, which uses a Scheme->C compiler. I wrote the above app in Gambit Scheme (view it in graphics.scm), and I will show you how to get your Scheme apps running on the iPhone. We need to compile the Gambit run-time for the iPhone first, then we can start writing our apps.
(Link: Writing apps for the iPhone in Scheme)