No ARC for specific files on iOS

gistfile1.txt

If you get the error: dyld: lazy symbol binding failed: Symbol not found: _objc_retain

from: http://stackoverflow.com/questions/6308425/ios-5-best-practice-release-retain

When you migrate a project to use ARC, the -fobjc-arc compiler flag is set as the default for all Objective-C source files. You can disable ARC for a
 specific class using the -fno-objc-arc compiler flag for that class. In Xcode, in the target Build Phases tab, open the Compile Sources group to 
reveal the source file list. Double-click the file for which you want to set the flag, enter -fno-objc-arc in the pop-up panel, then click Done.

http://stackoverflow.com/questions/8112035/libobjc-a-dylib-compile-error-on-ios-4-3

Also, add -fobjc-arc to "Other Linker" flags.