We've stumbled across an incompatiblity in mixing TR1 stuff from GCC 4.3 and Boost. The smallest test case is simply #include <tr1/array> #include <boost/tr1/tuple.hpp> This fails because GCC's array declares and specializes the GCC's tuple_size and tuple_element, while boost/tr1/tuple.hpp by default uses ::boost::fusion::tuple_size and tuple_element. It appears that defining BOOST_HAS_GCC_TR1 before including the boost libraries will solve the problem. Is there a better way? More importantly, this is code in part of library used by a number of other projects. Will we have to recompile the boost libraries (we're using the current Ubuntu package), and/or any of our projects that link against this code, or should linkage not be a problem? -- Anthony Foglia Princeton Consultants (609) 987-8787 x233