RHEL5, Boost 1.34.0, GCC 4.1.1 Boost headers are installed under /usr/include echo "#include " > test.cpp g++ -c test.cpp In file included from /usr/include/boost/tr1/type_traits.hpp:8, from test.cpp:1: /usr/include/boost/tr1/detail/config.hpp:58:26: error: no include path in which to search for utility from /usr/include/boost/tr1/type_traits.hpp:8 6 #ifndef BOOST_TR1_TYPE_TRAITS_HPP_INCLUDED 7 # define BOOST_TR1_TYPE_TRAITS_HPP_INCLUDED 8 # include /usr/include/boost/tr1/detail/config.hpp:58:26 37 #if defined(__GNUC__) && !defined(BOOST_HAS_INCLUDE_NEXT) 38 # define BOOST_HAS_INCLUDE_NEXT 39 #endif ... 53 #ifdef BOOST_HAS_INCLUDE_NEXT 54 # ifndef BOOST_TR1_NO_RECURSION 55 # define BOOST_TR1_NO_RECURSION 56 # define BOOST_TR1_NO_CONFIG_RECURSION 57 # endif 58 # include_next <utility> Have I configured something wrong? Or am I not just not using the Boost tr1 headers correctly? Chris