x11-toolkits/gtk20 -> x11-toolkits/gtk30
x11-toolkits/unique -> x11-toolkits/libunique3
www/webkit-gtk2 -> www/webkit-gtk3
x11-toolkits/vte -> x11-toolkits/vte3
audio/libcanberra -> audio/libcanberra-gtk3?
x11-themes/gtk-engines2 -> x11-themes/gtk-engines3