when a pty/tty device is used for the ppp connection.
-diff -u -r ppp-2.4.3/pppd/sys-linux.c ppp-2.4.3/pppd/sys-linux.c
---- ppp-2.4.3/pppd/sys-linux.c 2005-04-29 20:08:37.000000000 +0200
-+++ ppp-2.4.3/pppd/sys-linux.c 2005-04-29 20:07:03.000000000 +0200
-@@ -455,6 +455,13 @@
+Index: ppp-2.4.3/pppd/sys-linux.c
+===================================================================
+--- ppp-2.4.3.orig/pppd/sys-linux.c 2007-06-04 13:22:08.527558896 +0200
++++ ppp-2.4.3/pppd/sys-linux.c 2007-06-04 13:22:08.807516336 +0200
+@@ -453,6 +453,13 @@
if (new_style_driver) {
int flags;