Bug#326740: coq: FTBFS: "Type ... is not compatible with type ..."

[Andreas Jochens <aj@andaco.de>]

Package: coq
Version: 8.0pl2-2
Severity: serious

When building 'coq' on unstable, I get the following error:

      method set_pixels_inside_wrap : int -> unit
      method set_right_margin : int -> unit
      method set_wrap_mode : Gtk.Tags.wrap_mode -> unit
      method starts_display_line : GText.iter -> bool
      method undo : bool
      method visible_rect : Gdk.Rectangle.t
      method window_to_buffer_coords :
        tag:Gtk.Tags.text_window_type -> x:int -> y:int -> int * int
      method wrap_mode : Gtk.Tags.wrap_mode
    end
The instance variable obj has type
  ([> Gtk.text_view ] as 'a) Gtk.obj = 'a Gobject.obj
but is expected to have type
  Gtk.text_view Gtk.obj = Gtk.text_view Gobject.obj
Type 'a = [> `container | `gtk | `textview | `widget ]
is not compatible with type
  Gtk.text_view = [ `container | `gtk | `textview | `widget ] 
make[1]: *** [ide/undo.cmo] Error 2
make[1]: Leaving directory `/coq-8.0pl2'
make: *** [build-stamp] Error 2

Regards
Andreas Jochens