I've added a polygon.tar.gz archive of the sandbox version of gtl including docs and source code. http://svn.boost.org/svn/boost/sandbox/gtl/polygon.tar.gz This way you don't have to go through a subversion client to get the code. To compile against the code untar it into a directory, add that directory to your include path and use one of the example codes from the docs for your main() function. You will need boost in your include path as well. Header files of interest: point_data.hpp point_traits.hpp point_concept.hpp (relate to point usage and custom point examples.) polygon_traits.hpp (relates to polygon usage and custom polygon examples.) polygon_set_data.hpp polygon_set_traits.hpp polygon_set_concept.hpp (relates to polygon set usage and custom polygon set examples.) detail/polygon_set_view.hpp (how the operator templates work) Thanks, Luke