$ sudo emerge -av nvidia-drivers

These are the packages that would be merged, in order:

Calculating dependencies... done!
[blocks B     ] media-video/nvidia-glx (is blocking x11-drivers/nvidia-drivers-1.0.8762-r1)
[blocks B     ] media-video/nvidia-kernel (is blocking x11-drivers/nvidia-drivers-1.0.8762-r1)
[ebuild  N    ] x11-drivers/nvidia-drivers-1.0.8762-r1  USE="dlloader" 9,733 kB 

Total size of downloads: 9,733 kB

!!! Error: The above package list contains packages which cannot be installed
!!!        at the same time on the same system.