This is a build intended for Linux servers. It does not have a graphical interface.
The use of the helper scripts is recommended. You can host it without the scripts as follows:
1) Create a configuration file with the following contents (edit as needed):
[server] upnp=true lobby=true upnp_ttl=2 name="A server" port=39984 max_players=16 description="far, far away ..."
2) Run the server with this command:
OWNWAR_SETTINGS=your-configuration-file.cfg ./ownwar res://maps/the_pit/the_pit.tscn
The server will automatically register itself with the lobby if enabled. UPNP is recommended if the server behind a NAT as it will automatically open a port.