As x11-drivers/nvidia-drivers-358.16 is stable please stabilize nvidia-settings as well. See Bug 577684 - x11-drivers/nvidia-drivers-358.16-r1 don't compile
See also bug 568334 Yours is not a compile problem, you just need to add a package.keywords entry.
There is no problem with compiling nvidia-settings - this is just a stabilization request for version 358.16.
Personally, I don't see the point in the stabilization request. We are already moving in the direction of dropping nvidia-settings as a standalone package #562910, so stabilizing a package that is effectively on its way out seems like a waste of effort. Just my 2 cents.
@NP-Hardass: That sounds good - just do it :-) Currently nvidia-settings are blocking the update of nvidia-drivers.
*** This bug has been marked as a duplicate of bug 564390 ***