Having dbus 0.60 installed, emerge app-editors/mlview force dbus 0.23.4 to be installed. It's even worse if mlview is in world : each 'emerge -vauD world', the dbus version is changed.
arches, please stabilize the 0.8-r1 to avoid this crap, dbus support has been removed there since it didn't work with any recent version of dbus anyway.
app-editors/mlview-0.8-r1 stable on ppc
amd64 done
x86 done