You could tell that the nvidia cg toolkit can be found in non-free repositories (need to be activated in the package manager manually)
* http://pkgs.org/fedora-rawhide/rpmfusion-nonfree-i386/Cg-3.1.0013-3.fc19.i686.rpm.html
* http://pkgs.org/opensuse-12.3/opensuse-non-oss-i586/cg-3.1.0013-3.1.1.i586.rpm.html