The nvidia-settings dependency in Conky requires a x11-drivers/nvidia-drivers-340.93-r1. This keeps Conky from being compiled with the latest stable version of nvidia drivers in portage(ver. 361). Please remove the nvidia-settings settings. Ref https://github.com/brndnmtthws/conky/issues/295
Have you tried building conky with USE="-nvidia".
This appears to have been resolved in conky-1.10.x. *** This bug has been marked as a duplicate of bug 563718 ***