13.6.2014
Installing ROOT 6 on SL6

(the source archive
 ftp://root.cern.ch/root/root_v6.00.00.source.tar.gz
 does not have the correct directory structure)

git clone http://root.cern.ch/git/root.git

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root 6 needs gcc version >= 4.8 and the corresponding libraries
install devtoolset-2 from RedHat

sudo wget -O /etc/yum.repos.d/slc6-devtoolset.repo http://linuxsoft.cern.ch/cern/devtoolset/slc6-devtoolset.repo

sudo yum install devtoolset-2
(installs gcc but also eclipse (large))

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start a shell with the devtoolset linked:

scl enable devtoolset-2 zsh

check:
  gcc -v

export CPLUS_INCLUDE_PATH="/usr/local/include/gcc483" (or wherever your gcc 4.8 header files are)

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cd root

./configure --help | less

my choice:
./configure linuxx8664gcc --with-cc=/usr/local/gcc483/gcc --with-cxx=/usr/local//gcc483/g++ --with-f77=/usr/local/gcc483/gfortran --with-gcc-toolchain=/usr/local/gcc483/g++ --enable-mathmore --enable-memstat --enable-minuit2 --enable-roofit --enable-tmva --enable-unuran --disable-xrootd --disable-afdsmgrd --disable-afs --disable-bonjour --disable-globus --disable-xml

make
 (takes one hour)

   ============================================================
   ===                ROOT BUILD SUCCESSFUL.                ===
   === Run 'source bin/thisroot.sh' before starting ROOT ===
   ============================================================

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every day:
git pull
(scl enable devtoolset-2 zsh)
(export CPLUS_INCLUDE_PATH="/usr/local/include/gcc483")
make