Got a curious error during the merge of the latest VirtualBox ebuild for Gentoo:
it fails with a die:

Quote
kmk failed

It took a bit, but looking around the output gave some indication of a problem with one or more dependencies. Looking around the Gentoo Forum, I came across this thread, which had the proper solution.

The error, more in full, is attached.
A bit more to the top of the error (sorry, but couldn't capture the right line as the new merge was already busy), it complains about Xmd.h, and GLXext.h. In that way, the solution provided by the forum thread I mentioned earlier, makes sense. In my case, issuing the following commands did the trick:

mikuru ~ # eselect opengl set xorg-  ...