.. include:: ../images.rst


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/

The suggested version is the current latest stable, i.e. 6.24.06. The instructions to install ROOT are reported here: https://root.cern.ch/content/release-62406

For CIT cluster and VirtualBox the following precompiled version can be used:

.. image:: https://img.shields.io/badge/CentOS Cern 7 gcc4.8-download-blue.svg
   :target: https://root.cern.ch/download/root_v6.24.06.Linux-centos7-x86_64-gcc4.8.tar.gz
   
.. code-block:: bash

    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



.. code-block:: bash

    #  clone root from git repository
    git clone http://github.com/root-project/root.git
    # checkout a specific version
    git checkout -b v6-24-06 v6-24-06
    # create a building directory
    mkdir -p root/build_root; cd  root/build_root
    # configure root 
    cmake .. -DCMAKE_INSTALL_PREFIX:PATH=${HOME}/SOFT/ROOT/root_v6-24-06;
    # build
    cmake --build . --verbose --parallel ${CPU_COUNT}
    # install
    cmake --build . --verbose --parallel ${CPU_COUNT} --target install
    
.. note::
   set ROOT_VERSION environment variable in watenv script.