Index: am.h
--- am.h.orig	2008-02-01 14:35:55 +0100
+++ am.h	2008-02-02 10:56:36 +0100
@@ -18,6 +18,11 @@
 #define min(a, b)    (((a) < (b)) ? (a) : (b))		/* return the minimum of two values */
 #endif
 
+#if defined(__STDC__) && __STDC__+0 < 199901L
+#undef isinf
+#define isinf(x) 0
+#endif
+
 #ifndef	INFINITY
 #define INFINITY	HUGE_VAL			/* the floating point, positive infinity constant */
 #endif