C++ AppKit/AppKit.h Unknown type name 'NSString'

C++ with including AppKit/AppKit.h throws the error: «/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX13.3.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:603:9 Unknown type name 'NSString'»

C++ AppKit/AppKit.h Unknown type name 'NSString'
 
 
Q