ROOT installation

An object oriented framework for large scale data analysis

git repository : http://github.com/root-project/root.git

home site : https://root.cern.ch/

Note

For the recommended CMake build (see Installing a local copy of the cWB libraries), the easiest way to get ROOT is via conda-forge:

conda install -c conda-forge root_base

See the library README for the currently supported ROOT versions (CI-tested: 6.30, 6.32, 6.34; additionally validated on 6.36, the recommended target) and why ROOT 6.40 is not yet supported.

For the traditional Makefile build, ROOT is instead built from source. A version compatible with the CMake build’s supported range, e.g. 6.36, is suggested:

#  clone root from git repository
git clone http://github.com/root-project/root.git
# checkout a specific version
git checkout -b v6-36-06 v6-36-06
# create a building directory
mkdir -p root/build_root; cd  root/build_root
# configure root
cmake .. -DCMAKE_INSTALL_PREFIX:PATH=${HOME}/SOFT/ROOT/root_v6-36-06;
# build
cmake --build . --verbose --parallel ${CPU_COUNT}
# install
cmake --build . --verbose --parallel ${CPU_COUNT} --target install

For older, pre-existing CIT/VirtualBox setups, a precompiled ROOT 6.24.06 binary is also still available (legacy, no longer the suggested version):

https://img.shields.io/badge/CentOSCern7gcc4.8-download-blue.svg 
cd $HOME_LIBS/ROOT
wget https://root.cern.ch/download/root_v6.24.06.Linux-centos7-x86_64-gcc4.8.tar.gz
tar xf root_v6.24.06.Linux-centos7-x86_64-gcc4.8.tar.gz
mv root root_v6.24.06

Note

For the traditional Makefile build, set the ROOT_VERSION environment variable in the watenv script.