[BRLTTY] BRLTTY Udev Rules and Systemd

[Rob]

I copied the included
"udev.rules"
from the BRLTTY source package to
"/etc/udev/rules.d/brltty"
and left it at that. This is a systemd based Linux build. I use this method on my other system to have BRLTTY start automatically and it works great.
However, when I boot the new system, I see
"BRLTY 5.4 rev unknown"
on the display. That message just hangs there and nothing else happens.
Is this a problem with BRLTTY or systemd?