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math.h revision 1.1 
      1 /*	$NetBSD: math.h,v 1.1 2000/01/17 16:27:53 kleink Exp $	*/
      2 
      3 /*
      4  * ISO C99
      5  */
      6 #if !defined(_ANSI_SOURCE) && !defined(_POSIX_C_SOURCE) && \
      7     !defined(_XOPEN_SOURCE) || defined(_ISOC99_SOURCE)
      8 extern __const char	__nanf[];
      9 #define	NAN		(*(__const float *)(__const void *)__nanf)
     10 #endif
     11