It looks like bug #1103721 was a duplicate of this bug, so this has been
fixed in libvirt-1.0.1-0ubuntu2
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https://bugs.launchpad.net/bugs/667076
Title:
Ubuntu's libvirt is compiled
VirtualBox isn't needed anymore to be able to build the libvirt driver,
see this debian bug : http://bugs.debian.org/cgi-
bin/bugreport.cgi?bug=663589
VirtualBox is only a runtime dependency when one wants to use the
vbox:///session libvirt URI, like the VMware driver which is enabled
by default