id summary reporter owner description type status milestone component version severity resolution keywords cc 7327 Use traits to create null_vertex(). Ivan A. Melnikov Jeremiah Willcock In several places Boost.Graph uses Graph::null_vertex(), where graph traits should be used. This breaks compilation when Graph is external type with no static null_vertex() method. I will attach a patch that fixes this problem where it hit me, but there might be more. Bugs closed Boost 1.52.0 graph Boost 1.51.0 Problem fixed