In your CMSSW (release 6.1.1 or higher) area, use
cd $CMSSW_BASE/src
addpkg HiggsAnalysis/CombinedLimit V03-01-08
mkdir -p ttH
git clone https://github.com/cms-ttH/ttH-Limits.git ttH/Limits
# using https
git clone https://gitlab.cern.ch/cms-ttH/ttH-Limits-data.git ttH/Limits/data
# using kerberos
git clone https://:@gitlab.cern.ch:8443/cms-ttH/ttH-Limits-data.git ttH/Limits/data
scram b -j32
The latter two git commands clone our limit data repository, which has restricted access. These steps may be changed to use a submodule at a later point.
After running scram, run reduce_gamma_filesize in.root out.root to
reduce the filesize of the gamma files to an acceptable level.