Hi After downloading and untar the file "boost_1_56_0.tar.gz", I have installed Boost C++ library version "boost_1_56_0" in linux centos, I have run the following command to install. sudo ./bootstrap.sh --prefix=/usr/local sudo ./b2 install. It has been successfully installed. However when I checked the version it showed different version $ cat /usr/include/boost/version.hpp | grep "BOOST_LIB_VERSION" #define BOOST_LIB_VERSION "1_33_1" I have tried to install boost_1_55_0 as well in another folder but unfortunately still it shows version 1_33_1. Can anyone here tell me how I can fix it. Because of this issue I am unsuccessfull to configure Graph_tool that shows following error: checking for boostlib >= 1.53.0... configure: error: We could not detect the boost libraries (version 1.53 or higher). If you have a staged boost library (still not installed) please specify $BOOST_ROOT in your environment and do not give a PATH to --with-boost option. If you are sure you have boost installed, then check your version number looking in <boost/version.hpp>. See http://randspringer.de/boost for more documentation. Your help in this regrad would highly be appreciated -- View this message in context: http://main-discussion-list-for-the-graph-tool-project.982480.n3.nabble.com/... Sent from the Main discussion list for the graph-tool project mailing list archive at Nabble.com.