ROOT is not part of Debian as of the last stable version 9 (stretch). This is a quick installation guide from source that avoids debianization.
Download the source. When stretch was released in June 17 2017, the latest pro version of ROOT was 6.10/00.
sudo apt-get install cmake libx11-dev libxpm-dev libxft-dev libxext-dev libtiff5-dev libgif-dev libgsl-dev libpython-dev libkrb5-dev libxml2-dev libssl-dev default-libmysqlclient-dev libpq-dev libqt4-opengl-dev libgl2ps-dev libpcre-ocaml-dev libgraphviz-dev libdpm-dev unixodbc-dev libsqlite3-dev libfftw3-dev libcfitsio-dev dcap-dev libldap2-dev libavahi-compat-libdnssd-dev
Create a directory, for instance root, then untar the source,
mkdir root cd root tar -zxvf ../root_v6.10.00.source.tar.gz
Create a working directory,
mkdir build cd build
then configure, compile and install,
cmake ../root-6.10.00/ -DCMAKE_INSTALL_PREFIX=/usr/opt/root -Dgnuinstall=ON make -j4 sudo make install
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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