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math.h revision 1.3.6.2 
      1 /*	$NetBSD: math.h,v 1.3.6.2 2000/11/20 20:13:31 bouyer Exp $	*/
      2 
      3 /*
      4  * ISO C99
      5  */
      6 #if !defined(_ANSI_SOURCE) && \
      7     (!defined(_POSIX_C_SOURCE) && !defined(_XOPEN_SOURCE) || \
      8      defined(_ISOC99_SOURCE) || (__STDC_VERSION__ - 0) >= 199901L)
      9 extern __const char	__nanf[];
     10 #define	NAN		(*(__const float *)(__const void *)__nanf)
     11 #endif
     12