#endif
/* for Solaris */
-#if (! defined(HAVE_ISINF) && defined(HAVE_FPCLASS))
-# define HAVE_ISINF 1
-# ifdef isinf
+#if (! defined(HAVE_ISINF) && defined(HAVE_FPCLASS) && defined(FP_NINF) && defined(FP_PINF))
+# define HAVE_ISINF 1
+# ifdef isinf
# undef isinf
-# endif
-# define isinf(a) (!!(fpclass(a) & (FP_SNAN|FP_QNAN)))
-
+# endif
+# define isinf(a) (fpclass(a) == FP_NINF || fpclass(a) == FP_PINF)
#endif
/* solaris 10 it defines isnan such that only forte can compile it ... bad bad */