post_install() {
  if [ -f /bin/service ]; then
    echo "This package installs a wrapper to /bin/service because the Xerox driver"
    echo "invokes the service command, but Arch uses systemd (systemctl). This"
    echo "system already has a /bin/service file. We will not overwrite it."
    echo "Installation will cancel."
    return 1;
  fi

  echo 'Detecting printing subsystem'
  cd /opt/Xerox/prtsys; /opt/Xerox/prtsys/xeroxquemgr -setprtsubsys || echo 'Unable to detect printing subsystem' 1>> /tmp/PrtDrvInstaller.log 2>>/tmp/PrtDrvInstaller.log
  echo 'Registering man pages'

  env | grep DISPLAY > /opt/Xerox/prtsys/.xp_disp

  /opt/Xerox/prtsys/PatchAppArmorPolicy || echo 'AppArmor policy patch failed' 1>> /tmp/PrtDrvInstaller.log 2>>/tmp/PrtDrvInstaller.log

  if [ "_$DISPLAY" = "_" ]; then
      DISPLAY=:0.0 xhost +si:localgroup:lp >> /dev/null 2>> /dev/null || echo 'Failed to grant lp xhost permissions' 1>> /tmp/PrtDrvInstaller.log
  else
      xhost +si:localgroup:lp >> /tmp/PrtDrvInstaller.log 2>> /tmp/PrtDrvInstaller.log || echo 'Failed to grant lp xhost permissions' 1>> /tmp/PrtDrvInstaller.log
  fi
  echo "Run xeroxprtmgr as root to administer print queues"
}