diff --git a/x11/lightdm-gtk-greeter/Makefile b/x11/lightdm-gtk-greeter/Makefile
index b61ab57e96a9..ff096fe22301 100644
--- a/x11/lightdm-gtk-greeter/Makefile
+++ b/x11/lightdm-gtk-greeter/Makefile
@@ -1,36 +1,37 @@
 # Created by: Ben Woods <woodsb02@FreeBSD.org>
 
 PORTNAME=	lightdm-gtk-greeter
 PORTVERSION=	2.0.8
-PORTREVISION=	1
+PORTREVISION=	2
 CATEGORIES=	x11
 MASTER_SITES=	https://github.com/Xubuntu/${PORTNAME}/releases/download/${PORTNAME}-${PORTVERSION}/
 
 MAINTAINER=	desktop@FreeBSD.org
 COMMENT=	GTK+ greeter for LightDM
 
 LICENSE=	GPLv3
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 BUILD_DEPENDS=	xdt-csource:devel/xfce4-dev-tools
 LIB_DEPENDS=	liblightdm-gobject-1.so:x11/lightdm
 RUN_DEPENDS=	at-spi2-core>0:accessibility/at-spi2-core
 
 USES=		gettext gmake gnome localbase pkgconfig xorg
 USE_CSTD=	c99
 USE_GNOME=	cairo gdkpixbuf2 gtk30 intltool
 USE_XORG=	x11
 
 GNU_CONFIGURE=	yes
 INSTALLS_ICONS=	yes
+SUB_FILES=	pkg-deinstall pkg-install
 
 CONFIGURE_ARGS+=--disable-indicator-services-command \
 	--enable-at-spi-command=${LOCALBASE}/libexec/at-spi-bus-launcher
 
 OPTIONS_DEFINE=	DOCS
 
 post-install:
 	(cd ${STAGEDIR}${PREFIX}/etc/lightdm && ${MV} lightdm-gtk-greeter.conf \
 		lightdm-gtk-greeter.conf.sample)
 
 .include <bsd.port.mk>
diff --git a/x11/lightdm-gtk-greeter/files/pkg-deinstall.in b/x11/lightdm-gtk-greeter/files/pkg-deinstall.in
new file mode 100644
index 000000000000..0e8837b4c464
--- /dev/null
+++ b/x11/lightdm-gtk-greeter/files/pkg-deinstall.in
@@ -0,0 +1,19 @@
+#!/bin/sh
+
+PREFIX=${PKG_PREFIX-/usr/local}
+
+case $2 in
+DEINSTALL)
+	if grep -Fxq "greeter-session=lightdm-gtk-greeter" ${PREFIX}/etc/lightdm/lightdm.conf
+	then
+		echo ":: Removing greeter configuration in ${PREFIX}/etc/lightdm/lightdm.conf"
+		echo ":: Configure another greeter if you plan to keep using lightdm."
+		/usr/bin/sed -i ".bak" "s/^greeter-session=lightdm-gtk-greeter$/#greeter-session=example-gtk-gnome/g" \
+			${PREFIX}/etc/lightdm/lightdm.conf
+	else
+		echo ":: lightdm-gtk-greeter is not the configured greeter in ${PREFIX}/etc/lightdm/lightdm.conf"
+		echo ":: Leaving the lightdm greeter configuration unchanged."
+	fi
+	echo ":: $(grep greeter-session= ${PREFIX}/etc/lightdm/lightdm.conf)"
+	;;
+esac
diff --git a/x11/lightdm-gtk-greeter/files/pkg-install.in b/x11/lightdm-gtk-greeter/files/pkg-install.in
new file mode 100644
index 000000000000..b015bae0dd27
--- /dev/null
+++ b/x11/lightdm-gtk-greeter/files/pkg-install.in
@@ -0,0 +1,18 @@
+#!/bin/sh
+
+PREFIX=${PKG_PREFIX-/usr/local}
+
+case $2 in
+POST-INSTALL)
+	if grep -Fxq "#greeter-session=example-gtk-gnome" ${PREFIX}/etc/lightdm/lightdm.conf
+	then
+		echo ":: Setting lightdm-gtk-greeter as greeter session in ${PREFIX}/etc/lightdm/lightdm.conf"
+		/usr/bin/sed -i ".bak" "s/^#greeter-session=example-gtk-gnome$/greeter-session=lightdm-gtk-greeter/g" \
+			${PREFIX}/etc/lightdm/lightdm.conf
+	else
+		echo ":: A greeter has already been configured in ${PREFIX}/etc/lightdm/lightdm.conf"
+		echo ":: Leaving the lightdm greeter configuration unchanged."
+	fi
+	echo ":: $(grep greeter-session= ${PREFIX}/etc/lightdm/lightdm.conf)"
+	;;
+esac
diff --git a/x11/slick-greeter/Makefile b/x11/slick-greeter/Makefile
index f3f33ebb97cd..157e914fcfa3 100644
--- a/x11/slick-greeter/Makefile
+++ b/x11/slick-greeter/Makefile
@@ -1,53 +1,54 @@
 # Created by: Eric Turgeon <ericbsd@FreeBSD.org>
 
 PORTNAME=	slick-greeter
 PORTVERSION=	1.5.3
 CATEGORIES=	x11
-PORTREVISION=	1
+PORTREVISION=	2
 
 MAINTAINER=	ericbsd@FreeBSD.org
 COMMENT=	Slick-looking LightDM greeter
 
 LICENSE=	GPLv3
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 LIB_DEPENDS=	libcanberra-gtk3.so:audio/libcanberra-gtk3 \
 		libcanberra.so:audio/libcanberra \
 		libfreetype.so:print/freetype2 \
 		libharfbuzz.so:print/harfbuzz \
 		liblightdm-gobject-1.so:x11/lightdm
 BUILD_DEPENDS=	valac:lang/vala
 RUN_DEPENDS=	numlockx>=0:x11/numlockx
 
 USES=		autoreconf gettext gmake gnome localbase pkgconfig python:run shebangfix xorg
 USE_GNOME=	cairo dconf gdkpixbuf2 gtk30 intltool pygobject3
 
 USE_XORG=	pixman x11 xext
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	linuxmint
 
 GNU_CONFIGURE=	yes
 INSTALLS_ICONS=	yes
 SHEBANG_FILES=	files/usr/bin/slick-greeter-check-hidpi \
 		files/usr/bin/slick-greeter-set-keyboard-layout \
 		makepot
 bash_OLD_CMD=	/usr/bin/bash
 bash_CMD=	/bin/sh
+SUB_FILES=	pkg-deinstall pkg-install
 
 GLIB_SCHEMAS=	x.dm.slick-greeter.gschema.xml
 
 post-patch:
 	@${REINPLACE_CMD} -e 's|"/usr|"${PREFIX}|g' \
 		-e 's|"/etc|"${PREFIX}/etc|g' \
 		${WRKSRC}/files/usr/bin/slick-greeter-set-keyboard-layout \
 		${WRKSRC}/src/session-list.vala \
 		${WRKSRC}/src/settings.vala \
 		${WRKSRC}/src/slick-greeter.vala \
 		${WRKSRC}/src/user-list.vala
 	@${RM} ${WRKSRC}/files/usr/bin/slick-greeter-set-keyboard-layout.bak
 	@${MKDIR} ${WRKSRC}/files/${PREFIX}
 	@${MV} ${WRKSRC}/files/usr/bin ${WRKSRC}/files/${PREFIX}/bin
 	@${MV} ${WRKSRC}/files/usr/share ${WRKSRC}/files/${PREFIX}/share
 
 .include <bsd.port.mk>
diff --git a/x11/slick-greeter/files/pkg-deinstall.in b/x11/slick-greeter/files/pkg-deinstall.in
new file mode 100644
index 000000000000..38be3ef52c3f
--- /dev/null
+++ b/x11/slick-greeter/files/pkg-deinstall.in
@@ -0,0 +1,19 @@
+#!/bin/sh
+
+PREFIX=${PKG_PREFIX-/usr/local}
+
+case $2 in
+DEINSTALL)
+	if grep -Fxq "greeter-session=slick-greeter" ${PREFIX}/etc/lightdm/lightdm.conf
+	then
+		echo ":: Removing greeter configuration in ${PREFIX}/etc/lightdm/lightdm.conf"
+		echo ":: Configure another greeter if you plan to keep using lightdm."
+		/usr/bin/sed -i ".bak" "s/^greeter-session=slick-greeter$/#greeter-session=example-gtk-gnome/g" \
+			${PREFIX}/etc/lightdm/lightdm.conf
+	else
+		echo ":: slick-greeter is not the configured greeter in ${PREFIX}/etc/lightdm/lightdm.conf"
+		echo ":: Leaving the lightdm greeter configuration unchanged."
+	fi
+	echo ":: $(grep greeter-session= ${PREFIX}/etc/lightdm/lightdm.conf)"
+	;;
+esac
diff --git a/x11/slick-greeter/files/pkg-install.in b/x11/slick-greeter/files/pkg-install.in
new file mode 100644
index 000000000000..f6d24a6ce8e8
--- /dev/null
+++ b/x11/slick-greeter/files/pkg-install.in
@@ -0,0 +1,18 @@
+#!/bin/sh
+
+PREFIX=${PKG_PREFIX-/usr/local}
+
+case $2 in
+POST-INSTALL)
+	if grep -Fxq "#greeter-session=example-gtk-gnome" ${PREFIX}/etc/lightdm/lightdm.conf
+	then
+		echo ":: Setting slick-greeter as greeter session in ${PREFIX}/etc/lightdm/lightdm.conf"
+		/usr/bin/sed -i ".bak" "s/^#greeter-session=example-gtk-gnome$/greeter-session=slick-greeter/g" \
+			${PREFIX}/etc/lightdm/lightdm.conf
+	else
+		echo ":: A greeter has already been configured in ${PREFIX}/etc/lightdm/lightdm.conf"
+		echo ":: Leaving the lightdm greeter configuration unchanged."
+	fi
+	echo ":: $(grep greeter-session= ${PREFIX}/etc/lightdm/lightdm.conf)"
+	;;
+esac