external add_drive : t -> string -> unit = "ocaml_guestfs_add_drive"
external add_cdrom : t -> string -> unit = "ocaml_guestfs_add_cdrom"
external config : t -> string -> string option -> unit = "ocaml_guestfs_config"
+external set_qemu : t -> string -> unit = "ocaml_guestfs_set_qemu"
+external get_qemu : t -> string = "ocaml_guestfs_get_qemu"
external set_path : t -> string -> unit = "ocaml_guestfs_set_path"
external get_path : t -> string = "ocaml_guestfs_get_path"
external set_autosync : t -> bool -> unit = "ocaml_guestfs_set_autosync"