extern struct x_display_info *x_display_info_for_name P_ ((Lisp_Object));
extern struct x_display_info *x_term_init P_ ((Lisp_Object, char *, char *));
+extern int x_display_ok P_ ((const char *));
extern Lisp_Object x_list_fonts P_ ((struct frame *, Lisp_Object, int, int));
extern void select_visual P_ ((struct x_display_info *));