--- modules/Makefile.orig	Thu Mar 15 12:27:54 2007
+++ modules/Makefile	Mon Apr 23 10:18:59 2007
@@ -21,7 +21,7 @@
 CAMLOPT = $(OCAMLFIND) ocamlopt $(DBG) $(LIB)
 CAMLDEP = $(OCAMLFIND) ocamldep
 LIB = -I ../lib
-PP = -pp "camlp4o ../lib/xhtmlsyntax.cma -loc loc"
+PP = -pp "$(CAMLP4O) ../lib/xhtmlsyntax.cma -loc loc"
 
 OBJS = $(FILES:.ml=.cmo)