* lisp/vc/vc-annotate.el (vc-annotate-background-mode): Add :set

to reevaluate `vc-annotate-color-map'.

Fixes: debbugs:18189

lisp/ChangeLog

+2014-08-09  Juri Linkov  <juri@jurta.org>
+
+	* vc/vc-annotate.el (vc-annotate-background-mode): Add :set
+	to reevaluate `vc-annotate-color-map'.  (Bug#18189)
+
 2014-08-09  Alan Mackenzie  <acm@muc.de>
 
 	* progmodes/cc-fonts.el (c-font-lock-declarators): Remove check

lisp/vc/vc-annotate.el

@@ -54,6 +54,12 @@ When nil, the color range from `vc-annotate-color-map' is applied
 to the foreground, and the color from the option `vc-annotate-background'
 is applied to the background."
   :type 'boolean
+  :set (lambda (symbol value)
+	 (set-default symbol value)
+	 (when (boundp 'vc-annotate-color-map)
+	   (ignore-errors
+	     ;; Update the value of the dependent variable.
+	     (custom-reevaluate-setting 'vc-annotate-color-map))))
   :version "24.5"
   :group 'vc)