Ludovic Courtès <ludo@gnu.org> writes:

[...]

> That makes sense.  I guess we’re in trouble if there are both GTK+2 and
> GTK+3 packages in use, no?
Well, the 'icon-theme.cache' file compitable.
AFAIK, the code for `gtk-update-icon-cache' is same between GTK+2 and
GTK+3, and it only depends on glib and gdk-pixbuf.

And, here the new patch: