ftp.nice.ch/pub/next/developer/resources/libraries/libobjects.0.1.0.s.tar.gz#/libobjects-0.1.0/config.nextrt.m

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/* A function for testing if the compiler is using the NeXT Objective C
   runtime or not.

   With the NeXT runtime this file compiles and links.
   With the GNU runtime, this file does not link. 
*/

#include <objc/Object.h>

int libobjects_nextrt_checker ()
{
  id o = [[Object alloc] init];

  [o self];
  objc_msgSend(o, @selector(self));

  exit(0);
}

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