To install trackballs just follow these instructions.
/debian/wheezy/main///install/index.html An OpenGL-based game of marbles through a labyrinth Debian 7.0 games 1.1.4-4.1
sudo apt-get install trackballs
Which will install trackballs and any other packages on which it depends.
|Description||An OpenGL-based game of marbles through a labyrinth|