Fix the 'make depend' target to exclude empty directories
Fix the 'make depend' target to exclude empty directories

yallop/ocaml-ctypes,ocamllabs/ocaml-ctypes,ocamllabs/ocaml-ctypes,whitequark/ocaml-ctypes,whitequark/ocaml-ctypes,whitequark/ocaml-ctypes,yallop/ocaml-ctypes