:group 'minibuffer
:type 'boolean)
+;; Not always defined, but only called if next-read-file-uses-dialog-p says so.
+(declare-function x-file-dialog "xfns.c"
+ (prompt dir &optional default-filename mustmatch only-dir-p))
+
(defun read-file-name (prompt &optional dir default-filename mustmatch initial predicate)
"Read file name, prompting with PROMPT and completing in directory DIR.
Value is not expanded---you must call `expand-file-name' yourself.