billy1380 has put together a tutorial which shows how to get JEDI-SDL working on MacOS X, using Lazarus and the FPC compiler.

If you are planning on targetting MacOS X ( amongst other platforms ), this is a must read tutorial.

Look out in future for another tutorial that I am working on, which will cover using XCode 2.4.x ( the default MacOS X developer IDE ) with FPC and JEDI-SDL.