equery d -o -p cairo
[ Searching for packages depending on cairo... ]
gnome-base/librsvg-2.16.0
app-text/poppler-bindings-0.5.4
www-client/mozilla-firefox-1.5.0.7
dev-java/swt-3.2-r2
dev-python/pycairo-1.2.2
x11-libs/pango-1.14.7
x11-libs/libsvg-cairo-0.1.6
x11-libs/gtk+-2.10.6