sjc> Sorry, Boost.Pool does not currently support MSVC, due to that compiler's sjc> extreme lack of template support. It works with STLPort(www.stlport.com). On VC 6 you must define 2 helper functions __stl_alloc_create and __stl_alloc_rebind in namespace std. Some thing like that namespace std { template <class _Tp1, class _Tp2, class _Tp3, class _Mtx> inline boost::pool_allocator<_Tp2, _Tp3, _Mtx>& _STLP_CALL __stl_alloc_rebind(boost::pool_allocator<_Tp1, _Tp3, _Mtx>& __a, const _Tp2*) { return (boost::pool_allocator<_Tp2, _Tp3, _Mtx>&)(__a); } template <class _Tp1, class _Tp2, class _Tp3, class _Mtx> inline boost::pool_allocator<_Tp2, _Tp3, _Mtx> _STLP_CALL __stl_alloc_create(const boost::pool_allocator<_Tp1, _Tp3, _Mtx>&, const _Tp2*) { return boost::pool_allocator<_Tp2, _Tp3, _Mtx>(); } } On VC7 work without helper functions -Ilya