OS 4.0 features in backwards compatible app

I have an OS 4 app that was completely compatible with 3.x up until I added eventkit. Is there a way I can omit this feature if they are on a 3.x device? I have

#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 40000
...code
#endif

around my stuff but it seems to be failing on initial launch and I am thinking due to the linking of the EventKit.framework. The only error i am getting is the super descriptive

Data Formatters temporarily unavailable, will re-try after a 'continue'开发者_如何学JAVA. (Cannot call into the loader at present, it is locked.)

and if i remove this framework and comment out my eventkit code, it all works fine. Is there no way to prevent the linking of newer frameworks for older OS'?

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You should weak-link EventKit. Open your target, find EventKit under Linked Libraries, and change its type from Required to Weak.