How to install iphone sdk 4 on Mac OSX 10.5.8?

You're going to have to bite the bullet. The fact of the matter is that the later SDKs depend on features that are only available in 10.6 and not 10.5.

It's not so simple to upgrade your system. Not like everyone has a couple grand laying around all the time. Plus when your married, it's hard to justify spending 2k on a new computer when your current one works just fine for everything except deploying webapps as iphone apps.

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