Hi All, I compile read_dimacs_max_flow example ( http://www.boost.org/doc/libs/1_38_0/libs/graph/example/read_write_dimacs-eg...) with these warnnings. g++ -I/home/xianchen/opt/include/boost-1_38 -Wno-deprecated -c read.cpp -o objects/simu.o /home/xianchen/opt/include/boost-1_38/boost/graph/read_dimacs.hpp: In function 'int boost::read_dimacs_max_flow(Graph&, CapacityMap, ReverseEdgeMap, typename boost::graph_traits<G>::vertex_descriptor&, typename boost::graph_traits<G>::vertex_descriptor&, std::istream&) [with Graph = main()::Graph, CapacityMap = boost::adj_list_edge_property_map, boost::no_property> >, boost::edge_capacity_t>, ReverseEdgeMap = boost::adj_list_edge_property_map, boost::detail::edge_desc_impl&, unsigned int, boost::property, boost::no_property> >, boost::edge_reverse_t>]': read.cpp:86: instantiated from here /home/xianchen/opt/include/boost-1_38/boost/graph/read_dimacs.hpp:108: warning: deprecated conversion from string constant to 'char*' /home/xianchen/opt/include/boost-1_38/boost/graph/read_dimacs.hpp:108: warning: deprecated conversion from string constant to 'char*' ...... My GCC is: Using built-in specs. Target: i686-pc-linux-gnu Configured with: ../gcc-4.2.4/configure --prefix=/home/xianchen/opt --enable-shared --enable-threads=posix --enable-languages=c,c++ --enable-checking=release --enable-mpfr=/home/xianchen/opt/ --with-system-zlib Thread model: posix gcc version 4.2.4 I run this program using data "boost/libs/graph/example/max_flow.dat" But get segment fault: *** glibc detected *** free(): invalid pointer: 0x08053ff4 *** Aborted Can any one tell me the why this happen? The program aborts under GCC.4.3.3 either. Which version of GCC is the most boost friendly? Thanks in advance, Xian