I'd like to propose the following bits and pieces which I've found
useful.

        * gtk-1.2.defs (GtkStyle): Add font field.
        (GtkTreeItem): Add subtree field.
        (gtk_accelerator_name): New function.

        * gdk-1.2.defs (gdk_screen_width, gdk_screen_height,
        gdk_screen_width_mm, gdk_screen_height_mm, gdk_string_height,
        gdk_keyval_name, gdk_keyval_from_name, gdk_keyval_to_upper,
        gdk_keyval_to_lower, gdk_keyval_is_upper, gdk_keyval_is_lower):
        New functions.

I'm aware gtk 2 deprecates GtkTree and all GtkFont stuff, but until
guile-gtk makes a move in that direction they may as well be
available.