Hi, I'm using GCC 4.4 with Boost 1.40, and I've recently came across a library which uses tr1/tuple. The problem I'm running into now is that I include <boost/tr1/tuple.hpp>, and it does not include <tr1/tuple>, but rather pulls in the Boost implementation -- which gives me compile errors like /usr/include/boost/tr1/tuple.hpp:63: error: ‘tuple’ is already declared in this scope /usr/include/boost/tr1/tuple.hpp:72: error: ‘tuple_size’ is already declared in this scope /usr/include/boost/tr1/tuple.hpp:73: error: ‘tuple_element’ is already declared in this scope So I'd really like to pull in the TR1 implementation from the compiler, to avoid these collisions. In order to fix this, I tried to define BOOST_HAS_GCC_TR1 as specified in the docs -- without success, I'm getting now /usr/include/boost/tr1/type_traits.hpp:13:49: error: no include path in which to search for tr1/type_traits As described in the docs, I added several more defines: DBOOST_HAS_GCC_TR1 BOOST_TR1_DISABLE_INCLUDE_NEXT=1 BOOST_TR1_GCC_INCLUDE_PATH=/usr/include/c++/4.4/ without success, I'm still getting the "no include path" error. I'm using the system boost, which is installed in /usr/include/boost; and I'd really like to keep using it. Is there any other way to force Boost to pick up the compiler's TR1 library? Cheers, Anteru