I had some trouble once I’d installed steam. It would fail to find the swrast driver. After some searching I found that the following command pulled through the required libraries:

sudo dnf install xorg-x11-drv-nvidia-libs.i686

This didn’t work quite so well on Fedora 23 so try this…

sudo dnf install nvidia-driver-libs

or use yumex-dnf to install nvidia-driver-libs.