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