Currently, when typing `emerge -pv world` and there are no deps to be found for an ebuild, portage stops with an error message saying so. It would be lot nicer for portage to show other ebuilds which are upgradable (and may contain a security fixes). Output (just an idea) for ebuilds with broken deps: [broken xXx ] gnome-base/gnome-panel-2.14.0 [2.13.91] MISSING: ">=gnome-base/libgnome-2.13.7" [broken xXx ] gnome-base/gnome-panel-2.14.0 [2.13.91] MASKED: ">=gnome-base/libgnome-2.13.7"
Problem is you can't just ignore those and continue calculating the depency tree because it would modify the tree itself. There was already a discussion about this in #gentoo-portage with the outcome that it can't be done in a consistent manner.