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diff -pNaru5 driver/2.6.27.orig/dgnc_tty.c driver/2.6.27/dgnc_tty.c
--- driver/2.6.27.orig/dgnc_tty.c 2021-09-13 21:09:08.726233822 -0400
+++ driver/2.6.27/dgnc_tty.c 2021-09-13 21:09:55.913091170 -0400
@@ -3249,10 +3249,13 @@ static void dgnc_tty_flush_buffer(struct
DGNC_UNLOCK(ch->ch_lock, lock_flags);
DPR_IOCTL(("dgnc_tty_flush_buffer finish\n"));
}
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,13,0)
+int tty_check_change(struct tty_struct *tty);
+#endif
/*****************************************************************************
*
* The IOCTL function and all of its helpers
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