-main, the main libcanberra library
-gtk, libcanberra-gtk (gtk+2)
-gtk3 libcanberra-gtk3 (gtk+3)
This is needed for the ongoing GNOME3 work without forcing a global move
to gtk+3. The -gtk subpackage may disappear in the future when nothing
uses it.
This move will prevent the login/logout sounds to work in
gnome-session-2.X but it is a necessary evil to move forward.
EDONOTCARE/agreed by several
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