-OCAMLOPTIONS = -package "$(REQUIRES)" -predicates "$(PREDICATES)" -thread
-OCAMLC = ocamlfind ocamlc $(OCAMLOPTIONS) -g
-OCAMLOPT = ocamlfind ocamlopt $(OCAMLOPTIONS)
+OCAMLOPTIONS = -package "$(REQUIRES)" -predicates "$(PREDICATES)" -thread -rectypes
+ifeq ($(origin OCAMLPATH), undefined)
+OCAMLFIND = OCAMLPATH=../../components/METAS ocamlfind
+else
+OCAMLFIND = ocamlfind
+endif
+OCAMLC = $(OCAMLFIND) ocamlc $(OCAMLOPTIONS) -g
+OCAMLOPT = $(OCAMLFIND) ocamlopt $(OCAMLOPTIONS)