ftp.nice.ch/pub/next/developer/objc/appkit/ClassBuilder.NIHS.bs.tar.gz#/ClassBuilder/Source/NObject.h

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  #import <objc/Object.h>
  #import <appkit/Application.h>
@interface NObject: Object
{
}
+ doesNotRecognize: (SEL)aSelector ;
- doesNotRecognize: (SEL)aSelector ;
@end

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.