Hi !! While trying to compile boost python library which KCC 4.0f on Red Hat 7.0 with python 2.1.1 i get the two following errors in extension_class.hpp from boost 1.26 : "/home01/ahbhhxx/USR/boost_1_26_0/boost/python/detail/extension_class.hpp", line 247: error: identifier "non_null_from_python" is undefined return non_null_from_python(obj, boost::python::type<T*>()); ^ detected during instantiation of class "boost::python::python_extension_class_converters<T, U> [with T=Data, U=boost::python::detail::held_instance<Data>]" at line 26 of "../BPL_GCC/Boost_data.cc" "/home01/ahbhhxx/USR/boost_1_26_0/boost/python/detail/extension_class.hpp", line 327: error: identifier "non_null_from_python" is undefined { return *boost::python::detail::check_non_null(non_null_from_python(p, boost::python::type<T*>())); } ^ detected during instantiation of class "boost::python::python_extension_class_converters<T, U> [with T=Data, U=boost::python::detail::held_instance<Data>]" at line 26 of "../BPL_GCC/Boost_data.cc" Data is an Object mapped from C++ to python. The code compiles with gcc 2.96 on the same OS. Has anybody an idea to get rid of the compilation problem with KCC Thank you