(default-frame-background-mode): Add defvar.

diff --git a/lisp/startup.el b/lisp/startup.el
index f8c4958c122dd79c56fd6f5a4fa4a29561c75a31..55afbb170eb598d14840cd23dcb010e08fd3e73d 100644 (file)
--- a/lisp/startup.el
+++ b/lisp/startup.el
@@ -287,6 +287,8 @@ from being initialized."
 
 (defvar no-blinking-cursor nil)
 
+(defvar default-frame-background-mode)
+
 (defvar pure-space-overflow nil
   "Non-nil if building Emacs overflowed pure space.")