extern void register_font_driver (struct font_driver *driver, FRAME_PTR f);
extern void free_font_driver_list (FRAME_PTR f);
extern Lisp_Object font_update_drivers (FRAME_PTR f, Lisp_Object list);
extern void register_font_driver (struct font_driver *driver, FRAME_PTR f);
extern void free_font_driver_list (FRAME_PTR f);
extern Lisp_Object font_update_drivers (FRAME_PTR f, Lisp_Object list);