I was able to install nvidia-drivers while running gentoo-sources-2.6.27-r4
using the ebuild posted here: http://bugs.gentoo.org/show_bug.cgi?id=246425

On Fri, Dec 12, 2008 at 11:01 PM, Duncan <1i5t5.duncan@cox.net> wrote:

> Mansour Al Akeel <mansour.alakeel@gmail.com> posted
> 49433267.1090205@gmail.com, excerpted below, on  Fri, 12 Dec 2008 23:56:23
> -0400:
>
> > In file included from
> > /var/tmp/portage/x11-drivers/nvidia-drivers-173.14.09/work/NVIDIA-Linux-
> x86_64-173.14.09-pkg2/usr/src/nv/nv.c:14:
> > /var/tmp/portage/x11-drivers/nvidia-drivers-173.14.09/work/NVIDIA-Linux-
> x86_64-173.14.09-pkg2/usr/src/nv/nv-linux.h:107:27:
> > error: asm/semaphore.h: No such file or directory
>
> The arch-x86 (including 64-bit) header files were reorganized in kernel
> 2.6.27, and as that says, asm/semaphore.h (or more like asm-x86/
> semaphore.h) no longer exists in .27.  I won't install proprietaryware so
> no nvidia for me and no direct experience with it to help you with, but
> it's likely nVidia hasn't updated to take account of that yet (or if so
> it'd probably be with the newest drivers, which may not even be in
> portage yet let alone stable).
>
> You did mention switching your running kernel back to 2.6.26.x, which
> should work, but did you switch your kernel symlink back to it as well?
> If not, it's probably still pointing at the 2.6.27.x kernel, thus you'd
> still be getting the error.
>
> --
> Duncan - List replies preferred.   No HTML msgs.
> "Every nonfree program has a lord, a master --
> and if you use the program, he is your master."  Richard Stallman
>
>
>