I installed Xcode 4.2 on a Snow Lopard and when iOS SDK was published I imported the iOS 5.1 SDK following this topic Is it possible to get the iOS 5.1 SDK for Xcode 4.2 on Snow Leopard?
Now I need to import iOS 6 SDK and I would know if this tutorial is still working for iOS 6 SDK.
Thank you!
I tried following the tutorial that you have linked. It works perfectly for me. Just copy "6.0" instead of "5.1".