Undefined symbols for architecture x86_64:
"_OBJC_CLASS_$_NSArray", referenced from:
objc-class-ref in contacts.o
objc-class-ref in FormatHelper.o
"_OBJC_CLASS_$_NSMutableArray", referenced from:
objc-class-ref in FormatHelper.o
ld: symbol(s) not found for architecture x86_64
Not every package that needs xcbuild will want to use its build phase.
I have moved the xcbuild setup hook to the new attribute xcbuildHook.
This means that dontUseXcbuild is no longer needed. If you just need
to call xcbuild on its own you can just refer to xcbuild.
