-OCAMLBUILD_FLAGS := $(OCAMLBUILD_FLAGS_COMP) $(OCAMLBUILD_FLAGS_DIRS)
-OCAMLBUILD := ocamlbuild $(OCAMLBUILD_FLAGS)
+OCAMLBUILD_FLAGS_YACC := -yaccflag '-v'
+OCAMLBUILD := \
+ ocamlbuild \
+ -classic-display \
+ $(OCAMLBUILD_FLAGS_COMP) \
+ $(OCAMLBUILD_FLAGS_DIRS) \
+ $(OCAMLBUILD_FLAGS_YACC)