Index: last_value.hpp
===================================================================
RCS file: /cvsroot/boost/boost/boost/last_value.hpp,v
retrieving revision 1.5
diff -u -r1.5 last_value.hpp
--- last_value.hpp	25 Jul 2004 02:29:28 -0000	1.5
+++ last_value.hpp	8 Jun 2007 15:42:26 -0000
@@ -11,6 +11,7 @@
 #define BOOST_LAST_VALUE_HPP
 
 #include <cassert>
+#include <boost/config.hpp>
 
 namespace boost {
   template<typename T>
@@ -30,10 +31,15 @@
 
   template<>
   struct last_value<void> {
+#ifdef BOOST_NO_VOID_RETURNS
     struct unusable {};
 
   public:
     typedef unusable result_type;
+#else
+  public:
+    typedef void result_type;
+#endif // BOOST_NO_VOID_RETURNS
 
     template<typename InputIterator>
     result_type