It is better now, the previous error gone. But there are some problems with libplugins: Welcome to Yade bzr2680 301 FATAL yade.Omega /home/gladk/dem/yade/cleanComp/yade/core/Omega.cpp:204 loadPlugins: /home/gladk/dem/yade/cleanComp/build/lib/yade-cleanComp/plugins/libplugins.so: undefined symbol `GLUtils::QGLViewer::drawArrow(Eigen::Matrix const&, Eigen::Matrix const&, float, int)' 301 FATAL yade.Omega /home/gladk/dem/yade/cleanComp/yade/core/Omega.cpp:204 loadPlugins: /home/gladk/dem/yade/cleanComp/build/lib/yade-cleanComp/plugins/libplugins.so: /home/gladk/dem/yade/cleanComp/build/lib/yade-cleanComp/plugins/libplugins.so: undefined symbol: _ZN7GLUtils9QGLViewer9drawArrowERKN5Eigen6MatrixIdLi3ELi1ELi2ELi3ELi1EEES5_fi 301 FATAL yade.Omega /home/gladk/dem/yade/cleanComp/yade/core/Omega.cpp:204 loadPlugins: Bailing out. Aborted (core dumped) Could you not suggest where to fix it? Thanks Anton On Wed, Jan 26, 2011 at 3:19 PM, Anton Gladky