I understand that compiling is no longer necessary to read graphml files.My program compiles but does not link. It worked before I upgraded boost_1_71_0. Program: #include <iostream> #include #include using namespace std; using namespace boost;   typedef adjacency_list < vecS, vecS, bidirectionalS > graph_t;          graph_t g;   dynamic_properties dpg;   int main( )   {       read_graphml(cin, g, dpg, 0);                } Makefile: read_graphml_test: read_graphml_test.cpp              g++ -c -I/usr/local/boost_1_71_0 read_graphml_test.cpp     ############     g++ -I/usr/local/boost_1_71_0 -L/usr/local/boost_1_71_0/stage/lib read_graphml_test.o Error message: undefined reference to `boost::read_graphml(std::istream&, boost::mutate_graph&, unsigned long)' Thanx