However, OneFinger is trivial to install from source, since it is written in python and does not require compilation.
You can easily get the program in source form. First you'll have to get the sources (see below), then you'll have to install them. Regarding the installation: OneFinger is written in python and therefore easy to install, but it requires the libraries PyQt and PyKDE. Furthermore, it requires "konsole", "kdesu" and "kfind" to be in your path. These applications are usually included in the "kdebase" package.
More detailed installations instructions can be found in the sources.
Regarding how to get the sources, there are two ways to get the program in source form: the official source release and the CVS repository:
The latest source release of the OneFinger core and OneFinger applet are available here.
cvs -z3 -d:pserver:email@example.com:/cvsroot/onefinger checkout onefinger
This will create a directory called onefinger in your current dir, and put the source code of the OneFinger in it.
You can also browse the source code online with sourceforge: simply click here.