VirtualBox install now slightly annoying
For reasons that I'm sure involve lawyers, VirtualBox OSE requires some human intervention to correctly install. The 'additions' iso is flagged as unfetchable by emerge, so it must be downloaded manually and put into /usr/portage/distfiles.
http://download.virtualbox.org/virtualbox/1.6.6/VBoxGuestAdditions_1.6.6.iso
Obviously, '1.6.6' should be changed to the version du jour.
Once you've moved it to /usr/portage/distfiles, be sure to correct the file settings:
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chown portage:portage /usr/portage/distfiles/VBoxGuestAdditions_1.6.6.iso
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chmod 664 /usr/portage/distfiles/VBoxGuestAdditions_1.6.6.iso
The issue only manifests if you've got the 'additions' use flag enabled for app-emulation/virtualbox-ose, which you probably do because it's neato.