;; Declare external functions and variables
(declare-function message-fetch-field "message" (header &optional not-all))
(declare-function message-narrow-to-head-1 "message" nil)
-(declare-function nnimap-group-overview-filename "nnimap" (group server))
;; The following line suppresses a compiler warning stemming from gnus-sum.el
(declare-function gnus-summary-last-subject "gnus-sum" nil)
;; Customization variables
;; Implementation
+;; FIXME: nnimap-group-overview-filename was removed from Gnus in
+;; September 2010. Perhaps remove this function?
(defun org-gnus-nnimap-cached-article-number (group server message-id)
"Return cached article number (uid) of message in GROUP on SERVER.
MESSAGE-ID is the message-id header field that identifies the