On SL[C]6 try (this should give you a good environment for ROOT 5): yum remove qt3
yum install yum-utils
yum-builddep cernlib
yum install ftgl-devel glew-devel pcre-devel xz-devel
yum install fftw-devel gsl-devel python-devel libxml2-devel
yum install qt-devel qwt-devel
yum install mysql mysql-devel
yum install gcc gcc-c++ gcc-gfortran cvs git cmake
yum clean all
yum check-update
yum update
See also: Running ROOT without X font server