Emerge fails at unpack phase with error message:

>>> Source unpacked in /var/tmp/portage/x11-misc/xscreensaver-6.06/work
mv: cannot move '/var/tmp/portage/x11-misc/xscreensaver-6.06/work/xscreensaver-6.06' to a subdirectory of itself, '/var/tmp/portage/x11-misc/xscreensaver-6.06/work/xscreensaver-6.06/xscreensaver-6.06'

Fails on both 1.4 and next-release.