--- ppp-20030513/pppd/utils.c.orig	2003-04-07 04:09:04 +0400
+++ ppp-20030513/pppd/utils.c	2003-05-24 03:13:54 +0400
@@ -862,7 +862,7 @@
 /* Procedures for locking the serial device using a lock file. */
 #ifndef LOCK_DIR
 #ifdef __linux__
-#define LOCK_DIR	"/var/lock"
+#define LOCK_DIR	"/var/lock/serial"
 #else
 #ifdef SVR4
 #define LOCK_DIR	"/var/spool/locks"