$NetBSD$

--- boost/archive/basic_archive.hpp.orig	2011-01-19 17:33:55.000000000 +0000
+++ boost/archive/basic_archive.hpp
@@ -115,7 +115,7 @@ public:
     explicit class_id_type(const int t_) : t(t_){
         BOOST_ASSERT(t_ <= boost::integer_traits<base_type>::const_max);
     }
-    explicit class_id_type(const std::size_t t_) : t(t_){
+    explicit class_id_type(const size_t t_) : t(t_){
  //       BOOST_ASSERT(t_ <= boost::integer_traits<base_type>::const_max);
     }
     class_id_type(const class_id_type & t_) :