Development version (the whole repository):
git clone http://github.com/vmc-project/geant3.git
To switch to the ‘pro’ tagged version 4.4 (compatible with vmc 2.x, ROOT 6.x):
cd geant3
git checkout v4-4
To switch to the ‘old’ tagged version 3.9.p1 (compatible with vmc 1,x, ROOT 6.x):
cd geant3
git checkout v3-9-p1
To switch to the ‘old’ tagged version 2.7.p2 (compatible with ROOT 5.x):
cd geant3
git checkout v2-7-p2
For older versions see the correspondent tag and the required version of ROOT in the history file.