Since the latest changes in trunk I'm seeing linker errors while linking with the serialization library (VS2005 SP1, boost_serialization-vc80-mt-gd-1_40.lib): runtime_support.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: __thiscall boost::archive::archive_exception::archive_exception(enum boost::archive::archive_exception::_exception_code,char const *,char const *)" (__imp_??0archive_exception@archive@boost@@QAE@W4_exception_code@012@PBD1@Z) (note the leading underscore in _exception_code) Which is really strange as this symbol is the only missing one. OTOH, the library exports the symbol: boost::archive::archive_exception::archive_exception( enum boost::archive::archive_exception::exception_code, char const *,char const *); (note the missing underscore in exception_code) If I change the first parameter of the archive_exception constructor to be a 'int' everything builds fine. Any clues? Compiler issue? Regards Hartmut