--- a/boost/accumulators/statistics/rolling_sum.hpp	2008-12-30 11:30:45.000000000 -0800
+++ b/boost/accumulators/statistics/rolling_sum.hpp	2009-07-18 13:07:17.000000000 -0700
@@ -49,6 +49,8 @@
         template<typename Args>
         result_type result(Args const &args) const
         {
+            (void)args;
+
             return this->sum_;
         }
 
@@ -81,7 +83,7 @@
 //
 namespace extract
 {
-    extractor<tag::rolling_sum> const rolling_sum = {};
+    extern extractor<tag::rolling_sum> const rolling_sum = {};
 }
 
 using extract::rolling_sum;