extern struct x_display_info *x_display_info_for_display P_ ((Display *));
extern struct x_display_info *x_display_info_for_name P_ ((Lisp_Object));
+extern void x_set_frame_alpha P_ ((struct frame *));
extern struct x_display_info *x_term_init P_ ((Lisp_Object, char *, char *));
extern int x_display_ok P_ ((const char *));