diff -urN ppp-2.4.4/pppd/plugins/rp-pppoe/if.c ppp-2.4.4.new/pppd/plugins/rp-pppoe/if.c
--- ppp-2.4.4/pppd/plugins/rp-pppoe/if.c	2001-12-14 08:25:20.000000000 +0530
+++ ppp-2.4.4.new/pppd/plugins/rp-pppoe/if.c	2007-01-04 18:28:03.000000000 +0530
@@ -16,6 +16,7 @@
 static char const RCSID[] =
 "$Id: if.c,v 1.1 2001/12/14 02:55:20 mostrows Exp $";
 
+#define _GNU_SOURCE 1
 #include "pppoe.h"
 
 #ifdef HAVE_UNISTD_H