$NetBSD: patch-aj,v 1.1 2006/08/24 08:45:35 jmmv Exp $

--- boost/python/object/instance.hpp.orig	2006-08-23 23:48:06.000000000 +0200
+++ boost/python/object/instance.hpp
@@ -41,9 +41,16 @@ struct additional_instance_size
 {
     typedef instance<Data> instance_data;
     typedef instance<char> instance_char;
+#if    !(BOOST_WORKAROUND(__GNUC__, == 3) && BOOST_WORKAROUND(__GNUC_MINOR__, == 4)) \
+    && !(BOOST_WORKAROUND(__GNUC__, == 4))
     BOOST_STATIC_CONSTANT(
         std::size_t, value = sizeof(instance_data)
                            - BOOST_PYTHON_OFFSETOF(instance_char,storage));
+#else
+    BOOST_STATIC_CONSTANT(
+        std::size_t, value = sizeof(instance_data)
+                           - (sizeof(PyVarObject) + sizeof(PyObject*) + sizeof(PyObject*) + sizeof(instance_holder*)));
+#endif
 };
 
 }}} // namespace boost::python::object