Hi Luc,
The SQL Power Library project is also hosted on Google Code.
http://code.google.com/p/sqlpower-library
So you would have to check out that project as well and then install it
using Maven.
I apologize that we don't have that information openly available. We
should have a 'Getting Started' document available somewhere (I figure
the Google Code project wiki is one place).
Hope that helps! Let us know if you run into any further problems.
Cheers,
Jeff