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diff --git a/otherlibs/labltk/example/clock.ml b/otherlibs/labltk/example/clock.ml
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+(* $Id$ *)
+
+(* Clock/V, a simple clock.
+   Reverts every time you push the right button.
+   Adapted from ASCII/V May 1997
+
+   Uses Tk and Unix, so you must link with
+     labltklink unix.cma clock.ml -o clock -cclib -lunix
+*)
+
+open Tk
+
+(* pi is not a constant! *)
+let pi = acos (-1.)
+
+(* The main class:
+     * create it with a parent: [new clock parent:top]
+     * initialize with [#init]
+*)
+
+class clock :parent = object (self)
+
+  (* Instance variables *)
+  val canvas = Canvas.create :parent width:(`Pix 100) height:(`Pix 100) ()
+  val mutable height = 100
+  val mutable width = 100
+  val mutable rflag = -1
+
+  (* Convert from -1.0 .. 1.0 to actual positions on the canvas *)
+  method x x0 = `Pix (truncate (float width *. (x0 +. 1.) /. 2.))
+  method y y0 = `Pix (truncate (float height *. (y0 +. 1.) /. 2.))
+
+  initializer
+    (* Create the oval border *)
+    Canvas.create_oval canvas tags:[`Tag "cadran"]
+      x1:(`Pix 1) y1:(`Pix 1)
+      x2:(`Pix (width - 2)) y2:(`Pix (height - 2))
+      width:(`Pix 3) outline:(`Yellow) fill:`White;
+    (* Draw the figures *)
+    self#draw_figures;
+    (* Create the arrows with dummy position *)
+    Canvas.create_line canvas tags:[`Tag "hours"] fill:`Red
+      xys:[self#x 0.; self#y 0.; self#x 0.; self#y 0.];
+    Canvas.create_line canvas tags:[`Tag "minutes"] fill:`Blue
+      xys:[self#x 0.; self#y 0.; self#x 0.; self#y 0.];
+    Canvas.create_line canvas tags:[`Tag "seconds"] fill:`Black
+      xys:[self#x 0.; self#y 0.; self#x 0.; self#y 0.];
+    (* Setup a timer every second *)
+    let rec timer () =
+      self#draw_arrows (Unix.localtime (Unix.time ()));
+      Timer.add ms:1000 callback:timer; ()
+    in timer ();
+    (* Redraw when configured (changes size) *)
+    bind canvas events:[[],`Configure]
+      action:(`Set ([], fun _ ->
+	width <- Winfo.width canvas;
+	height <- Winfo.height canvas;
+	self#redraw));
+    (* Change direction with right button *)
+    bind canvas events:[[],`ButtonPressDetail 3]
+      action:(`Set ([], fun _ -> rflag <- -rflag; self#redraw));
+    (* Pack, expanding in both directions *)
+    pack [canvas] fill:`Both expand:true
+
+  (* Redraw everything *)
+  method redraw =
+    Canvas.coords_set canvas tag:(`Tag "cadran")
+      coords:[ `Pix 1; `Pix 1;
+	       `Pix (width - 2); `Pix (height - 2) ];
+    self#draw_figures;
+    self#draw_arrows (Unix.localtime (Unix.time ()))
+
+  (* Delete and redraw the figures *)
+  method draw_figures =
+    Canvas.delete canvas tags:[`Tag "figures"];
+    for i = 1 to 12 do
+      let angle = float (rflag * i - 3) *. pi /. 6. in
+      Canvas.create_text canvas tags:[`Tag "figures"]
+	text:(string_of_int i) font:"variable"
+	x:(self#x (0.8 *. cos angle))
+	y:(self#y (0.8 *. sin angle))
+	anchor:`Center
+    done
+
+  (* Resize and reposition the arrows *)
+  method draw_arrows tm =
+    Canvas.configure_line canvas tag:(`Tag "hours")
+      width:(`Pix (min width height / 40));
+    let hangle =
+      float (rflag * (tm.Unix.tm_hour * 60 + tm.Unix.tm_min) - 180)
+	*. pi /. 360. in
+    Canvas.coords_set canvas tag:(`Tag "hours")
+      coords:[ self#x 0.; self#y 0.;
+	       self#x (cos hangle /. 2.); self#y (sin hangle /. 2.) ];
+    Canvas.configure_line canvas tag:(`Tag "minutes")
+      width:(`Pix (min width height / 50));
+    let mangle = float (rflag * tm.Unix.tm_min - 15) *. pi /. 30. in
+    Canvas.coords_set canvas tag:(`Tag "minutes")
+      coords:[ self#x 0.; self#y 0.;
+	       self#x (cos mangle /. 1.5); self#y (sin mangle /. 1.5) ];
+    let sangle = float (rflag * tm.Unix.tm_sec - 15) *. pi /. 30. in
+    Canvas.coords_set canvas tag:(`Tag "seconds")
+      coords:[ self#x 0.; self#y 0.;
+	       self#x (cos sangle /. 1.25); self#y (sin sangle /. 1.25) ]
+end
+
+(* Initialize the Tcl interpreter *)
+let top = openTk ()
+
+(* Create a clock on the main window *)
+let clock =
+  new clock parent:top
+
+(* Wait for events *)
+let _ = mainLoop ()