Get client software from OSG

  rpm -Uvh http://dl.fedoraproject.org/pub/epel/5/i386/epel-release-5-4.noarch.rpm

  rpm -Uvh http://repo.grid.iu.edu/osg-el5-release-latest.rpm

  yum install yum-priorities

  yum install osg-wn-client

For detail see: OSG Documentation