Use CC=gcc32 in Fedora Core 1
The kernel in Fedora Core 1 is not compiled with the system's main compiler, to compile the nVidia drivers successfully, you must specify which compiler to use. For instance, the the (current as of this writing) nVidia drivers:
# CC=gcc32 sh NVIDIA-Linux-x86-1.0-5328-pkg1.run
Will compile and install the drivers.
Red Hat, Inc.