It is a simple wrapper for notify-send from x11-libs/libnotify which iterates over all running D-Bus session bus instances, sending the notification to every one of them.
Created attachment 230797 [details] The ebuild
The ebuild has been committed to Sunrise overlay; after a review, it'll be published at: http://overlays.gentoo.org/proj/sunrise/browser/reviewed/x11-misc/sw-notify-send
Using commit message: ------------------------------------------------------------------------------ A new ebuild for sw-notify-send, a system-wide notify-send wrapper. Moved from Sunrise per bug #318961. (Portage version: 2.2.0_alpha15_p1/cvs/Linux x86_64) ------------------------------------------------------------------------------ /var/cvsroot/gentoo-x86/x11-misc/sw-notify-send/metadata.xml,v <-- metadata.xml initial revision: 1.1 /var/cvsroot/gentoo-x86/x11-misc/sw-notify-send/ChangeLog,v <-- ChangeLog initial revision: 1.1 /var/cvsroot/gentoo-x86/x11-misc/sw-notify-send/sw-notify-send-0.1.1.ebuild,v <-- sw-notify-send-0.1.1.ebuild initial revision: 1.1