For strlen() declaration.

--- contrib/xmindpath/main.c.orig	Thu Nov 20 01:09:11 2014
+++ contrib/xmindpath/main.c	Thu Nov 20 01:09:08 2014
@@ -39,6 +39,7 @@
 #include <fcntl.h>
 #include <termios.h>
 #include <signal.h>
+#include <string.h>
 #include <X11/X.h>
 #include <X11/extensions/XTest.h>
 #include <X11/keysym.h>