Gtk-demo port on win32 / SDL_WINDOWID


I’ve tried the gtk-demo and it works well on my linux platform.
Then, I compiled it on win32 (vc++6) with the lastest gtk+ port, glib
etc… The problem is : SDL doesn’t seem to use the
"SDL_WINDOWID=some_number" environment variable. This variable is really put (i
verified with getenv) but it’s not used.
Consequently, I have two separate windows on win32 (one with gtk menus,
one with SDL things).

Any solution ?
Thanks in advance,