-OCAMLC = $(OCAMLFIND) @OCAMLC@ -package "$(REQUIRES)"
-OCAMLOPT = $(OCAMLFIND) @OCAMLOPT@ -package "$(REQUIRES)"
-OCAMLDEP = $(OCAMLFIND) @OCAMLDEP@ -package "$(REQUIRES)"
+OCAMLFLAGS = -I $(top_srcdir)/ocaml
+OCAMLC = $(OCAMLFIND) @OCAMLC@ $(OCAMLFLAGS) -package "$(REQUIRES)"
+OCAMLOPT = $(OCAMLFIND) @OCAMLOPT@ $(OCAMLFLAGS) -package "$(REQUIRES)"
+OCAMLDEP = $(OCAMLFIND) @OCAMLDEP@ $(OCAMLFLAGS) -package "$(REQUIRES)"