--- a/rogue4/passages.c	Fri Feb 26 17:30:30 2016 -0500
+++ b/rogue4/passages.c	Wed Mar 02 21:28:34 2016 -0500
@@ -10,14 +10,21 @@
  * See the file LICENSE.TXT for full copyright and licensing information.
  */
 
+#include <stdlib.h>
 #include <curses.h>
 #include "rogue.h"
 
+void conn(int r1, int r2);
+void door(struct room *rm, coord *cp);
+void passnum(void);
+void numpass(int y, int x);
+
 /*
  * do_passages:
  *	Draw all the passages on a level.
  */
-do_passages()
+void
+do_passages(void)
 {
     register struct rdes *r1, *r2 = NULL;
     register int i, j;
@@ -125,8 +132,8 @@
  * conn:
  *	Draw a corridor from a room in a certain direction.
  */
-conn(r1, r2)
-int r1, r2;
+void
+conn(int r1, int r2)
 {
     register struct room *rpf, *rpt = NULL;
     register char rmt;
@@ -269,9 +276,8 @@
  *	Add a door or possibly a secret door.  Also enters the door in
  *	the exits array of the room.
  */
-door(rm, cp)
-register struct room *rm;
-register coord *cp;
+void
+door(struct room *rm, coord *cp)
 {
     register int index;
 
@@ -291,7 +297,8 @@
  * add_pass:
  *	Add the passages to the current window (wizard command)
  */
-add_pass()
+void
+add_pass(void)
 {
     register int y, x, ch;
 
@@ -309,7 +316,8 @@
 static int pnum;
 static bool newpnum;
 
-passnum()
+void
+passnum(void)
 {
     register struct room *rp;
     register int i;
@@ -330,8 +338,8 @@
  * numpass:
  *	Number a passageway square and its brethren
  */
-numpass(y, x)
-register int y, x;
+void
+numpass(int y, int x)
 {
     register char *fp;
     register struct room *rp;