Unfortunately, a resync doesn't clear up the issue with nvidia-cg-toolkit and virtual/libstdc++. I'm not 100% sure, but I don't think that dependency used to be there. But I examined the ebuild; it's there now. In any case, I just unmerged the offending packages and was able to proceed with a world update. I may try putting an ebuild for nvidia-cg-toolkit in a local overlay which doesn't depend on virtual/libstdc++ and see if it causes any problems or if it works. Frankly I'm just incredulous at the idea that a toolkit released in 2012 would actually depend on a pre-gcc-3.4 library. Either the Gentoo maintainer goofed, or, if it's true, the guys at nVidia are insane.
