Import iOS 6 SDK into Xcode 4.2 on Snow Leopard

This worked for me (after "su -", so I'm running as root), and with the Xcode 4.5 .dmg file mounted as a disk drive.

echo copying iPhoneOS6.0.sdkcp -R /Volumes/Xcode/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk               /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/echo copying iphonesim6.0.sdkcp -R /Volumes/Xcode/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.0.sdk /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/echo copying devicesupport for 6.0cp -R /Volumes/Xcode/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/6.0\ \(10A403\)                 /Developer/Platforms/iPhoneOS.platform/DeviceSupport/#remove old -latest- linkrm -f /Developer/Platforms/iPhoneOS.platform/DeviceSupport/Latestecho setting up Latest linkcd /Developer/Platforms/iPhoneOS.platform/DeviceSupport/ln -s ./6.0\ \(10A403\) ./Latest

Note: Xcode dmg file available from https://developer.apple.com/downloads/index.action?name=Xcode (1.56 GB)

I tried following the tutorial that you have linked.It works perfectly for me. Just copy "6.0" instead of "5.1".

With a Intel Core Duo (32 bit) running Snow Leopard the iOS 6 simulator doesn't work (because some of the libraries are missing 32 bit variants).

It also appears that while it is possible to test on an iPhone 4 device upgraded to iOS6 by copying the iPhoneOS.platform files but it does not appear to be possible to do the same with an iPhone 5. I assume this is due to the new armv7s format on the device.

So what you can do depends on your mac and your iOS device.