Ok, guys, here's how to use Regnum with Fedora 17 and FOSS drivers:
Code:
# Enable RPMFusion (one line)
su -c 'yum localinstall --nogpgcheck http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-stable.noarch.rpm http://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-stable.noarch.rpm'
# install the libxtc package
su -c 'yum install libtxc_dxtn'
# install RegnumOnline
...
# Run it
...
I am using it with a AMD FirePro V4900 and it works greatª!

Out of the box, man!