To have ROOT working on openSUSE and on the SLC5 machines, you can set something like the following lines (this is for a zsh!) in your startup files (e.g. zshrc for a zsh):

if [[ -f /etc/SuSE-release ]]; then
        export ROOTSYS=${CERN}/root5.26.00a
        export PATH=${PATH}:${ROOTSYS}/bin
        export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:${ROOTSYS}/lib
fi

This will set the ROTTSYS variable only on openSUSE systems and will leave it empty for SLC5 system, where you should pick up the LHCb ROOT version.