[libvirt] question about libvirt.spec

While installing a libvirt-daemon package build from a slightly modified upstream spec file (e.g. fedora and rhel replaced with suse_version and sles_version), I noticed warnings such as "warning: user qemu does not exist - using root". %files of libvirt-daemon has several hypervisor-specific files and directories, e.g. %dir %attr(0750, %{qemu_user}, %{qemu_group}) ... but afaict libvirt-daemon has no dependency on a package that creates the qemu user:group (e.g. qemu or qemu-kvm). I thought about moving hypervisor-specific files to the libvirt-daemon-driver-<hypervisor> packages, but have a hunch they are in the libvirt-daemon package for a reason I'm not considering. Should these files and directories be moved to their respective libvirt-daemon-driver-<hypervisor> packages, making libvirt-daemon more hypervisor-neutral? Regards, Jim