Index: rs.c
===================================================================
RCS file: /cvs/src/usr.bin/rs/rs.c,v
retrieving revision 1.22
diff -u -r1.22 rs.c
--- rs.c	3 Dec 2012 19:26:24 -0000	1.22
+++ rs.c	15 Nov 2013 04:00:42 -0000
@@ -42,6 +42,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
 
 long	flags;
 #define	TRANSPOSE	000001