After downloading Xcode 6 beta 6, If you are receiving Apple Mach-O Linker error, Undefined symbols for architecture then try clearing the DerivedData for Xcode. Undefined symbols for architecture x86_64: “__TFSs26_forceBridgeFromObjectiveCU__FTPSs9AnyObject_MQ__Q_”, referenced from: Derived data folder location You find out the location of derived data using Xcode Preferences. Click Xcode -> Preferences. Click Locations tab […]