Version 4.14.3 is available upstream. Please consider updating! It seems that version 4.14.3 is available upstream, while the latest version in the Gentoo tree is 3.24.40. This information is provided from Release-Monitoring, so fix association issues there.
gtk-update-icon-cache is a tool from GTK+ to update icons and themes
caches.
It is split from the GTK+ sources by the Gentoo Gnome team to help
GTK+ 2 and 3 to co-exist better by extracting the single conflicting
tool.