--- w3c-markup-validator.postinst	2013-12-10 14:38:39.406932206 +0100
+++ w3c-markup-validator.postinst.new	2013-12-10 14:40:10.430951739 +0100
@@ -40,7 +40,8 @@
 
 	if [ ! -s /etc/$server/conf.d/w3c-markup-validator.conf ]; then
 	    ln -s /etc/w3c/httpd.conf   \
-                    /etc/$server/conf.d/w3c-markup-validator.conf
+                    /etc/$server/conf-available/w3c-markup-validator.conf
+            a2enconf w3c-markup-validator
         fi
 
         if [ $server = "apache2" ]; then