I upgraded my system tomorrow. But nvidia-drivers-331.17 can not build together 3.11.x kernels. I look what google says about it and find this patch:
It for version 325.15. But I think that it may help to solve..
(Quoting Doug Goldstein from bug #447566 comment #56)
> It is and has always been Gentoo's policy to support what NVIDIA supports. The current versions of the drivers do not support 3.11. You are more than welcome to use the capabilities of epatch_user (which are present in all the ebuilds) to make the changes yourself but they do not go into the main tree.
*** This bug has been marked as a duplicate of bug 447566 ***