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After installing Xcode 4.2 there is only iOS 5.0 SDK in Xcode.
Also I should support iPhone 3G with iOS 4.2.1.
How support two or more SDKs for one App with one Xcode?
I tried install Xcode 3 with iOS SDK 4.3 but Xcode crashes when starting.
Latest SDK included all required features from previous SDK versions. You shouldn’t worry about it. If you want to support iPhone 3G just set iOS Deployment Target to iOS 4.2 (or another would you like) in project settings at Build Settings tab.
Don’t remember to test your application on that iOS version.