I am a newbie from China, I am sorry about my poor English. I encountered a problem while using bgl. I need your help. and I'd like to know what compiler you are using while using bgl. My Environment: Windows2000 + devc++4.9.6.0(it uses g++ as it's compiler) But it can't compile and run the following example: _________Example start____________ #include <deque> // to store the vertex ordering #include <vector> #include <list> #include <iostream> #include <boost/graph/vector_as_graph.hpp> #include <boost/graph/topological_sort.hpp> int main() { using namespace boost; //create each labels of the tasks const char* tasks[] = { "pick up kids from school", "buy groceries (and snacks)", "get cash at ATM", "drop off kids at soccer practice", "cook dinner", "pick up kids from soccer", "eat dinner"}; const int n_tasks = sizeof(tasks)/sizeof(char*); //create the graph std::vector<std::list<int> >g(n_tasks); g[0].push_back(3); g[1].push_back(3); g[1].push_back(4); g[2].push_back(1); g[3].push_back(5); g[4].push_back(6); g[5].push_back(6); // perform the toplogical sort and output the result std::deque<int> topo_order; topological_sort(g, std::front_inserter(topo_order),vertex_index_map(identity_property_map())); int n = 1; for (std::deque<int>::iterator i = topo_order.begin();i != topo_order.end(); ++i, ++n) std::cout << tasks[*i] << std::endl; system("PAUSE"); } _________Example End_____________ it says: 36 ...\main.cpp instantiated from here I wondered it can compile another example:file_dependencies.cpp, which has also used topological_sort.