VirtualGL on Fedora 21

It isn't generating the key so the xauth merge fails
This link fixes paths, and I think might be relevant for my problem
https://github.com/chenxiaolong/Fedora-SRPMS/blob/master/VirtualGL/fix-paths-in-vglgenkey.patch

diff -Nru VirtualGL-2.3.orig/server/vglgenkey VirtualGL-2.3/server/vglgenkey--- VirtualGL-2.3.orig/server/vglgenkey 2012-02-25 00:12:07.913553458 -0500+++ VirtualGL-2.3/server/vglgenkey 2012-02-25 00:23:01.450462350 -0500@@ -1,17 +1,14 @@ #!/bin/sh XAUTH=xauth-if [ -x /usr/X11R6/bin/xauth ]; then- XAUTH=/usr/X11R6/bin/xauth+if [ -x /usr/bin/xauth ]; then+ XAUTH=/usr/bin/xauth fi-if [ -x /usr/openwin/bin/xauth ]; then- XAUTH=/usr/openwin/bin/xauth+if [ ! -d /etc/VirtualGL ]; then+ mkdir -p /etc/VirtualGL fi-if [ ! -d /etc/opt/VirtualGL ]; then- mkdir -p /etc/opt/VirtualGL+if [ -f /etc/VirtualGL/vgl_xauth_key ]; then+ rm /etc/VirtualGL/vgl_xauth_key fi-if [ -f /etc/opt/VirtualGL/vgl_xauth_key ]; then- rm /etc/opt/VirtualGL/vgl_xauth_key-fi-$XAUTH -f /etc/opt/VirtualGL/vgl_xauth_key generate $DISPLAY . trusted timeout 0 ||- $XAUTH -f /etc/opt/VirtualGL/vgl_xauth_key add $DISPLAY . `xauth list | awk '{print $3}'`-chmod 644 /etc/opt/VirtualGL/vgl_xauth_key+$XAUTH -f /etc/VirtualGL/vgl_xauth_key generate $DISPLAY . trusted timeout 0 ||+ $XAUTH -f /etc/VirtualGL/vgl_xauth_key add $DISPLAY . `xauth list | awk '{print $3}'`+chmod 644 /etc/VirtualGL/vgl_xauth_key

update: 

I was wrong about the source of the problem as I had misread the script. It sets it correctly.

Turns out this is a selinux problem which I am still trying to get the right settings to fix.

However a work around is to

sudo systemctl status gdm.service

for the path to the gdm Xorg server's xauth.

Then

sudo xauth -f <that file path> list

put this in your .Xauthority

Now I can run Glx apps in my Vnc session.

FTW.