Index: Mk/Uses/gnome.mk
===================================================================
--- Mk/Uses/gnome.mk
+++ Mk/Uses/gnome.mk
@@ -46,12 +46,6 @@
 #				file and add apropriate @postexec/@postunexec directives for
 #				each .omf file found to track OMF registration database.
 #
-# INSTALLS_ICONS	- If a GTK+ port installs Freedesktop-style icons to
-#				${LOCALBASE}/share/icons, then you should use this
-#				macro. Using this macro ensures that icons are cached
-#				and will display correctly. This macro isn't needed
-#				for QT based applications, which use a different method.
-#
 # MAINTAINER: gnome@FreeBSD.org
 
 .if !defined(_INCLUDE_USES_GNOME_MK)
@@ -458,24 +452,5 @@
 	done
 .endif
 
-.if defined(INSTALLS_ICONS)
-_USES_install+=	690:gnome-post-icons
-gnome-post-icons:
-	@${RM} ${TMPPLIST}.icons1
-	@for i in `${GREP} "^share/icons/.*/" ${TMPPLIST} | ${CUT} -d / -f 1-3 | ${SORT} -u`; do \
-		${ECHO_CMD} "@rmtry $${i}/icon-theme.cache" \
-			>> ${TMPPLIST}.icons1; \
-		${ECHO_CMD} "@postexec ${LOCALBASE}/bin/gtk-update-icon-cache -q -f %D/$${i} 2>/dev/null || /usr/bin/true" \
-			>> ${TMPPLIST}; \
-		${ECHO_CMD} "@postunexec ${LOCALBASE}/bin/gtk-update-icon-cache -q -f %D/$${i} 2>/dev/null || /usr/bin/true" \
-			>> ${TMPPLIST}; \
-	done
-	@if test -f ${TMPPLIST}.icons1; then \
-		${CAT} ${TMPPLIST}.icons1 ${TMPPLIST} > ${TMPPLIST}.icons2; \
-		${RM} ${TMPPLIST}.icons1; \
-		${MV} -f ${TMPPLIST}.icons2 ${TMPPLIST}; \
-	fi
-.endif
-
 .endif
 # End of use part.
Index: Mk/Uses/trigger.mk
===================================================================
--- /dev/null
+++ Mk/Uses/trigger.mk
@@ -0,0 +1,29 @@
+# Feature:	trigger
+# Usage:	USES=trigger
+# Valid ARGS:	none
+#
+# Variables:
+# TRIGGERS: list of triggers to package
+#
+# MAINTAINER= portmgr@FreeBSD.org
+
+.if !defined(_INCLUDE_USES_TRIGGER_MK)
+_INCLUDE_USES_TRIGGER_MK=	yes
+
+.if !empty(trigger_ARGS)
+IGNORE=	Incorrect 'USES+= trigger:${trigger_ARGS}' trigger takes no arguments
+.endif
+
+TRIGGERS?=	${PORTNAME}
+.for t in ${TRIGGERS}
+SUB_FILES+=	${t}.ucl
+PLIST_FILES+=	${LOCALBASE}/share/pkg/triggers/$t.ucl
+.endfor
+
+_USES_install+=	601:trigger-post-install
+trigger-post-install:
+	${MKDIR} ${STAGEDIR}${LOCALBASE}/share/pkg/triggers
+.for t in ${TRIGGERS}
+	${INSTALL_DATA} ${WRKDIR}/$t.ucl ${STAGEDIR}${LOCALBASE}/share/pkg/triggers/
+.endfor
+.endif
Index: graphics/gtk-update-icon-cache/Makefile
===================================================================
--- graphics/gtk-update-icon-cache/Makefile
+++ graphics/gtk-update-icon-cache/Makefile
@@ -2,6 +2,7 @@
 
 PORTNAME=	gtk-update-icon-cache
 PORTVERSION=	3.24.26
+PORTREVISION=	1
 CATEGORIES=	graphics
 DIST_SUBDIR=	gnome
 
@@ -11,7 +12,7 @@
 LICENSE=	LGPL20
 LICENSE_FILE=	${WRKSRC}/COPYING
 
-USES=		gettext gnome meson pkgconfig
+USES=		gettext gnome meson pkgconfig trigger
 USE_GNOME=	gdkpixbuf2
 USE_GITLAB=	yes
 GL_SITE=	https://gitlab.gnome.org
Index: graphics/gtk-update-icon-cache/files/gtk-update-icon-cache.ucl.in
===================================================================
--- /dev/null
+++ graphics/gtk-update-icon-cache/files/gtk-update-icon-cache.ucl.in
@@ -0,0 +1,18 @@
+path_glob: "*/share/icons/*"
+trigger: {
+	type: lua
+	sandbox: false
+	script: <<EOS
+-- make sure we only get the path one level after share/icons
+-- Ensure each path is uniq
+local hash = {}
+for _,path in ipairs(arg) do
+	path = string.match(path, ".*share/icons/[^/]*")
+	if (not hash[path]) and pkg.stat(path) then
+		print("Generating GTK icon cache for " .. path)
+		pkg.exec({"%%PREFIX%%/bin/gtk-update-icon-cache", "-q", "-t", "-f", path})
+		hash[path] = true
+	end
+end
+EOS
+}