where does kernel "include/linux/modversions.h" come from?

["Robert P. J. Day" <rpjday mindspring com>]

  *very* briefly (i can supply more details later if necessary),
i'm trying to install a patched NVIDIA driver (4363) under linux
kernel 2.5.70 on RH 9, based on the following recipe:

0) build 2.5.70 kernel, modules, install, etc., reboot to 2.5.70
1) download latest NVIDIA geforce driver (4363) from nvidia
2) download 2.5.70 patch from www.minion.de
3) extract source tree from NVIDIA driver
4) apply patch, symlink Makefile
5) run "nvidia-installer", which eventually fails with

----------------------------

nvidia-installer log file '/var/log/nvidia-installer.log'
creation time: Sat May 31 13:12:57 2003

option status:
  license pre-accepted    : false
  update                  : false
  force update            : false
  expert                  : false
  uninstall               : false
  driver info             : false
  no precompiled interface: false
  no ncurses color        : false
  query latest driver ver : false
  OpenGL header files     : false
  no questions            : false
  silent                  : false
  XFree86 install prefix  : /usr/X11R6
  OpenGL install prefix   : /usr
  Installer install prefix: /usr
  kernel include path     : (not specified)
  kernel install path     : (not specified)
  proc mount point        : /proc
  ui                      : (not specified)
  tmpdir                  : /tmp
  ftp site                : ftp://download.nvidia.com

Using: nvidia-installer ncurses user interface
-> License accepted.
-> There appears to already be a driver installed on your system (version: 1.0-
   4349).  As part of installing this driver (version: 1.0-4363), the existing 
   driver will be uninstalled.  Are you sure you want to continue? ('no' will a
   bort installation) (Answer: Yes)
-> No precompiled kernel interface was found to match your kernel; would you li
   ke the installer to attempt to download a kernel interface for your kernel f
   rom the NVIDIA ftp site (ftp://download.nvidia.com)? (Answer: No)
-> No precompiled kernel interface was found to match your kernel; this means
   that the installer will need to compile a new kernel interface.
ERROR: The kernel header file
       '/lib/modules/2.5.70/build/include/linux/modversions.h' does not exist. 
       The most likely reason for this is that the kernel header files in
       '/lib/modules/2.5.70/build/include' have not been configured.
ERROR: Installation has failed.  Please see the file
       '/var/log/nvidia-installer.log' for details.  You may find suggestions
       on fixing installation problems in the README available on the Linux
       driver download page at www.nvidia.com.

--------------------------------

  apparently, the installer *really* wants the kernel source file
"include/linux/modversions.h", but there *is* no such file in the 
2.5.70 source tree.

  there *is* an include/config/modversions.h, but i don't know
why i'm running into this.  is there a kernel config option i
forgot (i added all module options).

  can anyone explain where i should find the missing modversions.h
file?  thanks.

rday