-OCAMLC = $(OCAMLFIND) ocamlc -thread -package "$(REQUIRES)" -linkpkg
-OCAMLOPT = $(OCAMLFIND) ocamlopt -thread -package "$(REQUIRES)" -linkpkg
+OCAMLC = $(OCAMLFIND) ocamlc -thread -package "$(REQUIRES)" -linkpkg -rectypes
+OCAMLOPT = $(OCAMLFIND) ocamlopt -thread -package "$(REQUIRES)" -linkpkg -rectypes