% makepkg -s
==> Making package: nvidia-304xx 304.64-3 (Mon Feb  4 13:38:34 EST 2013)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> Retrieving Sources...
  -> Downloading NVIDIA-Linux-x86-304.64.run...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 37.5M  100 37.5M    0     0   717k      0  0:00:53  0:00:53 --:--:--  729k
  -> Found uapi-3.7.patch
==> Validating source files with md5sums...
    NVIDIA-Linux-x86-304.64.run ... Passed
    uapi-3.7.patch ... Passed
==> Extracting Sources...
==> Starting build()...
Creating directory NVIDIA-Linux-x86-304.64
Verifying archive integrity... OK
Uncompressing NVIDIA Accelerated Graphics Driver for Linux-x86 304.64................................................................................................................................................
patching file conftest.sh
patching file nv-mmap.c
Hunk #1 succeeded at 463 with fuzz 1 (offset 13 lines).
If you are using a Linux 2.4 kernel, please make sure
you either have configured kernel sources matching your
kernel or the correct set of kernel headers installed
on your system.

If you are using a Linux 2.6 kernel, please make sure
you have configured kernel sources matching your kernel
installed on your system. If you specified a separate
output directory using either the "KBUILD_OUTPUT" or
the "O" KBUILD parameter, make sure to specify this
directory with the SYSOUT environment variable or with
the equivalent nvidia-installer command line option.

Depending on where and how the kernel sources (or the
kernel headers) were installed, you may need to specify
their location with the SYSSRC environment variable or
the equivalent nvidia-installer command line option.

*** Unable to determine the target kernel version. ***

make: *** [select_makefile] Error 1
==> ERROR: A failure occurred in build().
    Aborting...