Recipe:
cmsrel CMSSW_10_2_9
cd CMSSW_10_2_9/src/
cmsenv
git cms-init
git clone https://github.com/cms-nanoAOD/nanoAOD-tools.git PhysicsTools/NanoAODTools
cd $CMSSW_BASE/src
git clone https://github.com/HephyAnalysisSW/RootTools.git
cd $CMSSW_BASE/src
git clone --recursive https://github.com/danbarto/WH_studies.git
cd $CMSSW_BASE/src
scram b -j 8