-DESTDIR = $(INSTROOT)/@DESTDIR@
-LIBDIR = $(DESTDIR)/lib/pppd/$(VERSION)
-
-VERSION = $(shell awk -F '"' '/VERSION/ { print $$2; }' ../../patchlevel.h)
+PREFIX = @DESTDIR@
+DESTDIR = $(INSTROOT)$(PREFIX)
+LIBDIR = $(INSTROOT)@LIBDIR@
+VERSION = @VERSION@
+PLUGINDIR = $(LIBDIR)/pppd/$(VERSION)