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.
sudo apt-get install dpkg-dev cmake g++ gcc binutils git python3-numpy python3-pygments python3-yaml libx11-dev libxpm-dev libxft-dev libxext-dev libssl-dev libpng-dev libjpeg-dev python3-dev liblzma-dev libxxhash-dev libzstd-dev libgsl-dev liblz4-dev libgif-dev libtiff-dev libxml2-dev libmariadbd-dev libsqlite3-dev libfftw3-dev libcfitsio-dev libxrootd-dev libxrootd-client-dev libgfal2-dev davix-dev libtbb-dev libblas-dev
Define ROOT version,
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,
Define the ROOT environment variables in your .bashrc,
export ROOTSYS=/usr/opt/root export PATH=$PATH:$ROOTSYS/bin export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$ROOTSYS/lib/root
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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