A small glitch: configure of virtualbox-guest-additions complains that --prefix is unrecognized. build.log attached. Reproducible: Always
Created attachment 288239 [details] build.log (part) First part of the build.log, taken while emerge was still running.
Pardon my ingorance but I fail to reproduce this problem. I do not even see any call to econf in the whole ebuild...
Can't reproduce anymore.