$NetBSD: patch-ae,v 1.1.1.1 2009/04/08 16:31:56 drochner Exp $

--- play.c.orig	1995-04-10 21:11:28.000000000 +0300
+++ play.c
@@ -3,6 +3,7 @@
 #include <string.h>
 #include <stdlib.h>
 #include <ctype.h>
+#include <unistd.h>
 
 #include "externs.h"
 #include "globals.h"