This is the kernel-module needed by the proprietary binary nvidia driver.
You also need the nvidia-legacy173-driver package from SlackBuilds.org.
To build the package for a kernel different from the running one,
start the script setting the KERNEL variable as in
Maintained by: Edward Koenig
Approved by: rworkman
Keywords: Geforce 5,xorg,nvidia,legacy
(the SlackBuild does not include the source)