dh_icons is a debhelper program that updates caches of Freedesktop icons when needed, using the update-icon-caches program provided by GTK+2.12. Currently this program does not handle installation of the
files, though it may do so at a later date, so should be run after icons are installed in the package
build directories.
It takes care of adding maintainer script fragments to call update-icon-caches for icon directories.
(This is not done for gnome and hicolor icons, as those are handled by triggers.) These commands are
inserted into the maintainer scripts by dh_installdeb(1).