diff -Naur Numeric-24.2.old//Packages/RNG/Src/ranf.c Numeric-24.2//Packages/RNG/Src/ranf.c
--- Numeric-24.2.old//Packages/RNG/Src/ranf.c	2011-12-25 16:03:49.218750000 -0300
+++ Numeric-24.2//Packages/RNG/Src/ranf.c	2011-12-25 16:04:09.828125000 -0300
@@ -149,9 +149,9 @@
 #else
 	struct timeval tv;
 	struct timezone tz;
-#if !defined(__sgi)
-	int gettimeofday(struct timeval *, struct timezone *);
-#endif
+#if !defined(__sgi) && !defined(__CYGWIN__)
+	int gettimeofday(struct timeval *, struct timezone *);
+#endif
 
 	(void)gettimeofday(&tv,&tz);
 	s48[0] = (u32)tv.tv_sec;