Support from iOS 4.3 onwards

I am planning to use different storyboards (one with and another without autolayout) because I need to have my app from 4.3 to 5.0(without autolayout) and 6.0 onwards (with autolayout) but I cannot build it on my device as I'm failed by

Illegal Configuration: Auto Layout on iOS Versions prior to 6.0

I don't think I should disable my storyboard autolayout as I got another storyboard to cater the old devices. How do I able to manage this?