-/* HUGE_VAL is traditionally defined as positive infinity, or
- alternatively, DBL_MAX. */
-#if !HAVE_ISINF && !defined (isinf)
-#define isinf(X) (fabs (X) == HUGE_VAL)
-#endif
-
-/* A Not a Number is not equal to itself. */
-#if !HAVE_ISNAN && !defined (isnan)
-#define isnan(X) ((X) != (X))
-#endif
-
-/* Finite numbers are not infinities or NaNs. */
-#if !HAVE_FINITE && !defined (finite)
-#define finite(X) (!isinf (X) && !isnan (X))
-#elif HAVE_IEEEFP_H
-#include <ieeefp.h> /* Declares finite() under Solaris. */
-#endif
-