Taken from FreeBSD ports

patch-screen.h

--- screen.h.orig	2003-08-22 05:28:43.000000000 -0700
+++ screen.h	2011-11-07 11:53:41.739890820 -0800
@@ -22,6 +22,8 @@
  * $Id: screen.h,v 1.12 1994/05/31 12:32:54 mlschroe Exp $ FAU
  */
 
+#include <string.h>
+
 #include "os.h"
 
 #if defined(__STDC__)