* lisp/gnus/gnus-html.el (image-size): Declare.

(declare-function): Add compat stub for ancient Emacs.

lisp/gnus/ChangeLog

+2013-09-13  Glenn Morris  <rgm@gnu.org>
+
+	* gnus-html.el (declare-function): Add compat stub for ancient Emacs.
+	(image-size): Declare.
+
 2013-09-12  Glenn Morris  <rgm@gnu.org>
 	* gnus-icalendar.el (gnus-icalendar-event--build-reply-event-body):

lisp/gnus/gnus-html.el

@@ -28,6 +28,10 @@
 
 ;;; Code:
 
+;; For Emacs <22.2 and XEmacs.
+(eval-and-compile
+  (unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
+
 (eval-when-compile (require 'cl))
 
 (require 'gnus-art)
@@ -438,6 +442,9 @@ Return a string with image data."
      (truncate (* gnus-max-image-proportion
                   (- (nth 3 edges) (nth 1 edges)))))))
 
+;; Behind display-graphic-p test.
+(declare-function image-size "image.c" (spec &optional pixels frame))
+
 (defun gnus-html-put-image (data url &optional alt-text)
   "Put an image with DATA from URL and optional ALT-TEXT."
   (when (gnus-graphic-display-p)