An Easy Recipe to install ROOT

#I am assuming you are using tcsh
cd somedir
wget ftp://root.cern.ch/root/root_v5.26.00c.source.tar.gz
tar xzf root_v5.26.00c.source.tar.gz
setenv ROOTSYS $PWD/root
setenv PATH $ROOTSYS/bin:$PATH
cd root
./configure
make