Emacs will prefer /usr/share/info/emacs-23 over /usr/share/info.
The value of Info-default-directory-list has been augmented via
site-init.el to include /usr/share/info/emacs-23 before
/usr/share/info.
--- /dev/null
+
+;; Add the flavor specific directory for Debian.
+(setq Info-default-directory-list
+ (let ((result nil)
+ (found-match nil))
+ (dolist (elt Info-default-directory-list (nreverse result))
+ (if (and (not found-match) (equal elt "/usr/share/info/"))
+ (progn
+ (push "/usr/share/info/emacs-23" result)
+ (setq found-match t)))
+ (push elt result))))