int cur_x, cur_y; /* -1, -1 for no cursor displayed. */
};
-static char *interpret_move(game_state *from, game_ui *ui, game_drawstate *ds,
+static char *interpret_move(game_state *from, game_ui *ui, const game_drawstate *ds,
int x, int y, int button)
{
int cx, cy;