Index: Makefile
===================================================================
--- Makefile	(revision 484652)
+++ Makefile	(working copy)
@@ -23,7 +23,7 @@
 
 PORTSCOUT=	limitw:1,even
 
-USES=		gettext gnome localbase:ldflags meson pkgconfig python:3.6+,build tar:xz
+USES=		gettext gl gnome localbase:ldflags meson pkgconfig python:3.6,build tar:xz
 USE_GNOME=	gnomedesktop3 gtk30
 USE_XORG=	ice sm x11 xcomposite xtrans
 USE_GL=		egl gl glesv2
@@ -33,6 +33,9 @@
 		-Dconsolekit=true
 BINARY_ALIAS=	python3=${PYTHON_VERSION}
 
+post-configure:
+EXTRA_PATCHES=	${FILESDIR}/extra-patch-gnome-session.xml.in
+
 GLIB_SCHEMAS=	org.gnome.SessionManager.gschema.xml
 
 .include <bsd.port.mk>
Index: distinfo
===================================================================
--- distinfo	(revision 484652)
+++ distinfo	(working copy)
@@ -1,3 +1,3 @@
-TIMESTAMP = 1524855068
+TIMESTAMP = 1541893279
 SHA256 (gnome3/gnome-session-3.28.1.tar.xz) = b893f75c8d34dbdbbc5c56429a17b59136ac7402e12f384da856dcfc725cd592
 SIZE (gnome3/gnome-session-3.28.1.tar.xz) = 480196
Index: files/extra-patch-gnome-session.xml.in
===================================================================
--- files/extra-patch-gnome-session.xml.in	(nonexistent)
+++ files/extra-patch-gnome-session.xml.in	(working copy)
@@ -0,0 +1,9 @@
+--- doc/dbus/gnome-session.xml.in.orig	2018-11-10 22:59:16 UTC
++++ doc/dbus/gnome-session.xml.in
+@@ -1,5 +1,5 @@
+ <?xml version="1.0" encoding="UTF-8"?>
+-<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" [
++<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" [
+ <!ENTITY dbus-Manager SYSTEM "org.gnome.SessionManager.ref.xml">
+ <!ENTITY dbus-Client SYSTEM "org.gnome.SessionManager.Client.ref.xml">
+ <!ENTITY dbus-ClientPrivate SYSTEM "org.gnome.SessionManager.ClientPrivate.ref.xml">

Property changes on: files/extra-patch-gnome-session.xml.in
___________________________________________________________________
Added: fbsd:nokeywords
## -0,0 +1 ##
+yes
\ No newline at end of property
Added: svn:eol-style
## -0,0 +1 ##
+native
\ No newline at end of property
Added: svn:mime-type
## -0,0 +1 ##
+text/plain
\ No newline at end of property