-LIBRARIES = $(shell ocamlfind query -recursive -predicates "byte $(PREDICATES)" -format "%d/%a" $(REQUIRES))
-LIBRARIES_OPT = $(shell ocamlfind query -recursive -predicates "native $(PREDICATES)" -format "%d/%a" $(REQUIRES))
+OCAMLC_P4 = $(OCAMLFIND) ocamlc $(OCAMLDEBUGOPTIONS) $(OCAMLOPTIONS) $(SYNTAXOPTIONS)
+OCAMLOPT_P4 = $(OCAMLFIND) opt $(OCAMLOPTIONS) $(SYNTAXOPTIONS)
+
+LIBRARIES = $(shell $(OCAMLFIND) query -recursive -predicates "byte $(PREDICATES)" -format "%d/%a" $(REQUIRES))
+LIBRARIES_OPT = $(shell $(OCAMLFIND) query -recursive -predicates "native $(PREDICATES)" -format "%d/%a" $(REQUIRES))