the stuff that was missing with me was the package pkgconfig.
So in order to install the nvidia-installer on Fedora Core 64 bit,one has to read the message
"HOWTO: Installing the nvidia X driver in Fedora Core 5"
(which I did) but then one has to be sure that the packages
are installed . In my case pkgconfig was not installed. Perhaps this information can be written in the "HOWTO"- message mentioned above.
Thanks for the advice