diff -up ppp-2.4.5/pppd/plugins/pppol2tp/Makefile.linux.instroot ppp-2.4.5/pppd/plugins/pppol2tp/Makefile.linux
--- ppp-2.4.5/pppd/plugins/pppol2tp/Makefile.linux.instroot	2010-03-15 13:35:54.521597076 +0100
+++ ppp-2.4.5/pppd/plugins/pppol2tp/Makefile.linux	2010-03-15 13:36:18.707597787 +0100
@@ -6,7 +6,7 @@ INSTALL	= install
 
 #***********************************************************************
 
-DESTDIR = @DESTDIR@
+DESTDIR = $(INSTROOT)@DESTDIR@
 LIBDIR = $(DESTDIR)/lib/pppd/$(VERSION)
 
 VERSION = $(shell awk -F '"' '/VERSION/ { print $$2; }' ../../patchlevel.h)