asrock portage # cat package.unmask
>=x11-libs/cairo-1.1.6
>=x11-libs/gtk+-2.10.0
>=x11-libs/pango-1.13.0
>=dev-libs/glib-2.12.0
asrock portage # emerge -p gtk+

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild   R   ] x11-libs/gtk+-2.8.19
asrock portage #