Stefan Fiedler:

package/gnome2/gtk+/postinstall.sh

@@ -0,0 +1,27 @@
+
+# update gnome2 icon cache files for gnome2 directories that
+# contain index.theme files
+
+echo "Gnome 2 icon cache files: running gtk-update-icon-cache..."
+
+all_installed "gnome2/share/.*/index.theme$" |
+while read IDX; do
+	gtk-update-icon-cache "${IDX%index.theme}"
+done
+
+# update gnome2 icon cache files for icon directories
+# that don't contain an index.theme file
+
+all_touched "gnome2/share/.*/icons" |
+while read FILE; do
+	DIR="${FILE%icons/*}icons"
+	[ ! -e "$DIR/index.theme" ] && 
+		gtk-update-icon-cache --ignore-theme-index "$DIR"
+done
+
+all_touched "gnome2/share/icons/hicolor" |
+while read FILE; do
+	DIR="${FILE%hicolor/*}hicolor"
+	[ ! -e "$DIR/index.theme" ] && 
+		gtk-update-icon-cache --ignore-theme-index "$DIR"
+done