Undefined symbols for architecture x86_64:
"_OBJC_CLASS_$_NSData", referenced from:
objc-class-ref in qmacfunctions.o
"_OBJC_CLASS_$_NSMutableArray", referenced from:
objc-class-ref in qmactoolbar.o
objc-class-ref in qmactoolbardelegate.o
ld: symbol(s) not found for architecture x86_64