How do you enforce the minimum OS requirements in a Cocoa app?

Question

My app needs to run on 10.4 or later. If I launch it on 10.3 it just fails to launch or crashes.

How do you tactfully enforce minimum system requirements? Can you customize the message it shows?

Answer 1

Add a key to your applications Info.plist, specifying LSMinimumSystemVersion as 10.4.X for whatever X you need as a minor version. For more, see Apple's documentation.