How do I add Leopard and Snow Leopard support to a Lion Cocoa App?

I think it's generally not a very good idea to develop for the latest OS then try to support older OSes at the last minute. If you've used any APIs that were introduced in an OS later than the oldest you're trying to support, you'll have to rewrite code to avoid using those APIs. It's generally not worth the trouble.

First, install the 10.5 SDK on your Mac. This may not be necessary, but do it anyway. You can find instructions on the Internet.

Keep in mind that compiling with the 10.5 SDK will ensure compatibility, but you won't be able to use newer OS X features unless you load them dynamically.

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