--- a/xrogue/outside.c	Fri Feb 19 21:02:28 2016 -0500
+++ b/xrogue/outside.c	Wed Mar 02 21:13:26 2016 -0500
@@ -15,7 +15,8 @@
 #include <curses.h>
 #include "rogue.h"
 
-extern char rnd_terrain(), get_terrain();
+char rnd_terrain(void);
+char get_terrain(char one, char two, char three, char four);
 
 /*
  * init_terrain:
@@ -23,7 +24,7 @@
  */
 
 void
-init_terrain()
+init_terrain(void)
 {
     register struct room *rp;
 
@@ -40,9 +41,7 @@
 }
 
 void
-do_terrain(basey, basex, deltay, deltax, fresh)
-int basey, basex, deltay, deltax;
-bool fresh;
+do_terrain(int basey, int basex, int deltay, int deltax, bool fresh)
 {
     register int cury, curx;        /* Current y and x positions */
 
@@ -140,7 +139,7 @@
  */
 
 char
-rnd_terrain()
+rnd_terrain(void)
 {
     int chance = rnd(100);
 
@@ -164,8 +163,7 @@
  */
 
 char
-get_terrain(one, two, three, four)
-char one, two, three, four;
+get_terrain(char one, char two, char three, char four)
 {
     register int i;
     int forest = 0, mountain = 0, lake = 0, meadow = 0, total = 0;