I got this after emerge --sync && layman -S





<net-print/hplip-1.7.4a-r1 (is blocking net-print/cups-1.2.11)
net-dns/avahi (is blocking net-misc/mDNSResponder-107.6-r5)
x11-drivers/ati-drivers (is blocking x11-base/xorg-server-1.3.0.0)
x11-plugins/beryl-dbus (is blocking x11-plugins/beryl-plugins-0.2.1)
net-misc/mDNSResponder (is blocking net-dns/avahi-0.6.19)