(nnmail-extra-headers): Add defvar.

diff --git a/lisp/gnus/nnheader.el b/lisp/gnus/nnheader.el
index 5cc26cb07d9a5d28f8ea686d86199d324b124dc9..45e030027a9d09249497edf70330e7b5d2c2a6b6 100644 (file)
--- a/lisp/gnus/nnheader.el
+++ b/lisp/gnus/nnheader.el
@@ -31,6 +31,8 @@
 
 (eval-when-compile (require 'cl))
 
+(defvar nnmail-extra-headers)
+
 ;; Requiring `gnus-util' at compile time creates a circular
 ;; dependency between nnheader.el and gnus-util.el.
 ;;(eval-when-compile (require 'gnus-util))