--- ray/src/hd/rholo3.c	1997/12/19 09:55:36	3.15
+++ ray/src/hd/rholo3.c	1997/12/24 12:22:58	3.16
@@ -247,11 +247,11 @@ init_global()			/* initialize global ray computation *
 
 
 mergeclists(cdest, cl1, n1, cl2, n2)	/* merge two sorted lists */
-PACKHEAD	*cdest;
-PACKHEAD	*cl1, *cl2;
+register PACKHEAD	*cdest;
+register PACKHEAD	*cl1, *cl2;
 int	n1, n2;
 {
-	int	cmp;
+	register int	cmp;
 
 	while (n1 | n2) {
 		if (!n1) cmp = 1;