Conf.check_prog "ocamlfind" "ocamlfind printconf";;
Conf.check_prog "pkg-config" "pkg-config --version";;
-(*Conf.check_prog "libxml++-2.6" "pkg-config --exists libxml++-2.6" ;;*)
+Conf.check_prog "camlp4" "ocamlfind query camlp4";;
Conf.check_prog "ulex" "ocamlfind query ulex";;
Conf.check_prog "expat" "ocamlfind query expat";;