Here's the log file from the nVidia installer. It might be easier to understand my problem if you see this.
I've already installed the libc package from debian.org, and it worked fine. So no problem there. But the installer isn't picking it up? nvidia-installer log file '/var/log/nvidia-installer.log' creation time: Mon Jul 30 18:50:20 2007 option status: license pre-accepted : false update : false force update : false expert : false uninstall : false driver info : false precompiled interfaces : true no ncurses color : false query latest version : false OpenGL header files : true no questions : false silent : false no recursion : false no backup : false kernel module only : false sanity : false add this kernel : false no runlevel check : false no network : false no ABI note : false no RPMs : false no kernel module : false force SELinux : default no X server check : false force tls : (not specified) X install prefix : (not specified) X library install path : (not specified) X module install path : (not specified) OpenGL install prefix : (not specified) OpenGL install libdir : (not specified) utility install prefix : (not specified) utility install libdir : (not specified) doc install prefix : (not specified) kernel name : (not specified) kernel include path : (not specified) kernel source path : (not specified) kernel output path : (not specified) kernel install path : (not specified) proc mount point : /proc ui : (not specified) tmpdir : /tmp ftp mirror : ftp://download.nvidia.com RPM file list : (not specified) Using: nvidia-installer ncurses user interface -> License accepted. -> 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: Yes) -> No matching precompiled kernel interface was found on the NVIDIA ftp site; this means that the installer will need to compile a kernel interface for your kernel. ERROR: You do not appear to have libc header files installed on your system. Please install your distribution's libc development package. 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.