I tested icaclient installed without media-libs/libcanberra with "gtk" flag and it works very well. media-libs/libcanberra-0.30-r5::gentoo USE="gnome gtk3 pulseaudio sound -alsa -gstreamer -gtk -oss -tdb -udev" I didn't noticed anything broken. Thank you and in case it's really somehow required, sorry for bugreport.