--- a/rogue4/chase.c	Fri Feb 26 17:30:30 2016 -0500
+++ b/rogue4/chase.c	Wed Mar 02 21:28:34 2016 -0500
@@ -10,6 +10,7 @@
  * See the file LICENSE.TXT for full copyright and licensing information.
  */
 
+#include <stdlib.h>
 #include <curses.h>
 #include "rogue.h"
 
@@ -17,11 +18,16 @@
 
 coord ch_ret;				/* Where chasing takes you */
 
+bool chase(THING *tp, coord *ee);
+int do_chase(THING *th);
+coord *find_dest(THING *tp);
+
 /*
  * runners:
  *	Make all the running monsters move.
  */
-runners()
+void
+runners(void)
 {
     register THING *tp;
 	register THING *ntp;
@@ -46,8 +52,8 @@
  * do_chase:
  *	Make one thing chase another.
  */
-do_chase(th)
-register THING *th;
+int
+do_chase(THING *th)
 {
     register struct room *rer, *ree;	/* room of chaser, room of chasee */
     register int mindist = 32767, i, dist;
@@ -184,8 +190,8 @@
  * see_monst:
  *	Return TRUE if the hero can see the monster
  */
-see_monst(mp)
-register THING *mp;
+bool
+see_monst(THING *mp)
 {
     if (on(player, ISBLIND))
 	return FALSE;
@@ -203,9 +209,8 @@
  *	Set a mosnter running after something or stop it from running
  *	(for when it dies)
  */
-runto(runner, spot)
-register coord *runner;
-coord *spot;
+void
+runto(coord *runner, coord *spot)
 {
     register THING *tp;
 
@@ -234,9 +239,8 @@
  *	chasee(ee).  Returns TRUE if we want to keep on chasing later
  *	FALSE if we reach the goal.
  */
-chase(tp, ee)
-THING *tp;
-coord *ee;
+bool
+chase(THING *tp, coord *ee)
 {
     register int x, y;
     register int dist, thisdist;
@@ -339,8 +343,7 @@
  *	in any room.
  */
 struct room *
-roomin(cp)
-register coord *cp;
+roomin(coord *cp)
 {
     register struct room *rp;
     register char *fp;
@@ -360,8 +363,8 @@
  * diag_ok:
  *	Check to see if the move is legal if it is diagonal
  */
-diag_ok(sp, ep)
-register coord *sp, *ep;
+bool
+diag_ok(coord *sp, coord *ep)
 {
     if (ep->x == sp->x || ep->y == sp->y)
 	return TRUE;
@@ -372,8 +375,8 @@
  * cansee:
  *	Returns true if the hero can see a certain coordinate.
  */
-cansee(y, x)
-register int y, x;
+bool
+cansee(int y, int x)
 {
     register struct room *rer;
     coord tp;
@@ -396,8 +399,7 @@
  *	find the proper destination for the monster
  */
 coord *
-find_dest(tp)
-register THING *tp;
+find_dest(THING *tp)
 {
     register THING *obj;
     register int prob;