Ocamlbuild_pack.Displayval create : ?channel:out_channel -> ?mode:[ `Classic | `Sophisticated ] -> ?columns:int ->
?description:tagline_description -> ?log_file:string -> ?log_level:int -> unit -> displayval finish : ?how:[ `Error | `Quiet | `Success ] -> display -> unitval display : display -> (out_channel -> unit) -> unitval update : display -> unitval is_logging : display -> int -> boolval dprintf : ?raw:bool -> ?log_level:int -> display -> ('a, Format.formatter, unit) format -> 'a