Setup notes for sample C++ programs using ROOT classes

To get the C++ example programs on this site, you can download the
compressed tarball file, e.g., mc.tar.gz, tmva.tar.gz, etc., to your
work directory, then unpack with e.g.

gunzip mc.tar.gz
tar -xvf mc.tar

This will produce the subdirectory mc (or whatever) and place into it
all of the required files.

To build and run any of the C++ programs on this site you need to have
ROOT set up on your machine.  The basic info on how to do this can be
found from root.cern.ch, for example, see

  http://root.cern.ch/drupal/content/development-version-52704

for info on setting up Version 5.27/04.

For example, at CERN on lxplus under bash you type:

. /afs/cern.ch/sw/lcg/contrib/gcc/4.3/x86_64-slc5/setup.sh
. /afs/cern.ch/sw/lcg/app/releases/ROOT/5.27.04/x86_64-slc5-gcc43-opt/root/bin/thisroot.sh

or if you are using (t)csh, you say:

source /afs/cern.ch/sw/lcg/external/gcc/4.3/x86_64-slc5/setup.csh
source /afs/cern.ch/sw/lcg/app/releases/ROOT/5.27.04/x86_64-slc5-gcc43-opt/root/bin/thisroot.csh

This sets up root and defines the environment variable ROOTSYS.
After doing this you should be able to download the source code and
GNUmakefile in any of the subdirectories and then type gmake to
build the executable program.

G. Cowan
9.8.10