--- linux-2.5.28-rmap-slablru/drivers/char/tty_io.c~	Wed Jul 24 20:56:01 2002
+++ linux-2.5.28-rmap-slablru/drivers/char/tty_io.c	Wed Jul 24 23:41:31 2002
@@ -545,6 +545,7 @@
 #endif
 	do_tty_hangup((void *) tty);
 }
+EXPORT_SYMBOL(tty_vhangup);
 
 int tty_hung_up_p(struct file * filp)
 {