Hello,

> if (point_color ma_fourmi.x ma_fourmi.y) = white
> is allways false under Ocaml.

If the following code says "BUG" in your environment, I am afraid that
there is a bug inside the graphics library. In such case, could you
send me the result of the command xdpyinfo in your environment ? 

(* ocamlc -o testgraphics graphics.cma testgraphics.ml *)
open Graphics
let _ = 
    open_graph "";
    if point_color 0 0 = white then 
      prerr_endline "OK"
    else prerr_endline "BUG"
;;

--
Jun
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