The following patch to Boost.test clears the serialisation lib failures with VC6 see : http://tinyurl.com/y3qpqf OK to commit (release branch only: I assume cvs HEAD no longer supports VC6 anyway)? John. Index: boost/test/test_tools.hpp =================================================================== RCS file: /cvsroot/boost/boost/boost/test/test_tools.hpp,v retrieving revision 1.60.2.1 diff -u -r1.60.2.1 test_tools.hpp --- boost/test/test_tools.hpp 24 Jul 2006 00:43:17 -0000 1.60.2.1 +++ boost/test/test_tools.hpp 25 Oct 2006 18:26:11 -0000 @@ -482,7 +482,7 @@ //____________________________________________________________________________//-struct BOOST_TEST_DECL equal_impl_frwd {+struct /*BOOST_TEST_DECL*/ equal_impl_frwd { template <typename Left, typename Right> inline predicate_result call_impl( Left const& left, Right const& right, mpl::false_ ) const