diff -upr xfce4-session-4.12.1.orig/scripts/xinitrc.in.in xfce4-session-4.12.1/scripts/xinitrc.in.in
--- xfce4-session-4.12.1.orig/scripts/xinitrc.in.in	2015-03-16 09:29:52.000000000 +0200
+++ xfce4-session-4.12.1/scripts/xinitrc.in.in	2017-03-03 04:11:03.591724694 +0200
@@ -87,6 +87,14 @@ cat /dev/null $XRESOURCES | xrdb -nocpp
 # load local modmap
 test -r $HOME/.Xmodmap && xmodmap $HOME/.Xmodmap
 
+# source system xinitrc scripts
+if [ -d /etc/X11/xinit/xinitrc.d ]; then
+    for f in /etc/X11/xinit/xinitrc.d/?*.sh; do
+        [ -x "$f" ] && . "$f"
+    done
+    unset f
+fi
+
 # run xfce4-session if installed
 if which xfce4-session >/dev/null 2>&1; then