graphlcd - Prepare group membership for media-plugins/vdr-graphlcd.
legacy-homedir - Keep old home directory /var/vdr of an existing installation. When this useflag is cleared, the home directory is switched to FHS conformant /var/lib/vdr
remote - Prepare group membership for media-plugins/vdr-remote.
serial - Prepare group membership for media-plugins/vdr-serial.
systemd - Enable use of systemd-specific libraries and features like socket activation or session tracking
