Installing CERN ROOT on Debian GNU/Linux 11 (bullseye)

by Ricardo Yanez
Last updated: March 1, 2022

bullseye version (buster, stretch, squeeze)

ROOT is not part of Debian as of the last stable version 11 (bullseye). This is a quick installation guide from source that avoids debianization.

Download the source.

Install dependencies,

sudo apt-get install dpkg-dev cmake g++ gcc binutils libx11-dev libxpm-dev libxft-dev libxext-dev libssl-dev libpng-dev libjpeg-dev

Define ROOT version,

export ROOTVER=6.20.02

Create a directory, for instance root, then untar the source,

mkdir root
cd root
tar -zxvf ../root_v$ROOTVER.source.tar.gz

Create a working directory,

mkdir build
cd build

then configure, compile and install,

cmake ../root-$ROOTVER/ -DCMAKE_INSTALL_PREFIX=/usr/opt/root-$ROOTVER -Dgnuinstall=ON
make -j4
sudo make install
sudo ln -sf /usr/opt/root-$ROOTVER /usr/opt/root

The option '-j' in make means the number of jobs to run simultaneously, in this case, four. In multi-core systems this reduces the compilation time considerably.

Update the dynamic linker,

sudo ldconfig

Define the ROOT environment variables in your .bashrc,

export ROOTSYS=/usr/opt/root
export PATH=$PATH:$ROOTSYS/bin

If the system has many ROOT users, it may be advantageous to define these variables system-wide in /etc/bash.bashrc instead.

Run root at the terminal-emulator.

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