There are different games in portage with ggz support (libggz in portage), where ggz needs to be activated.
Created attachment 85916 [details]
widelands-0.0.9.5 ebuild example
An example for widelands with ggz flag support.
please file individual bugs (preferably, with patches) for the games. Lists of bugs in a single bug makes it hard to track. Thanks.
reopening since this is now for one game...
quoting from build-12 changelog:
"- Removed support for GGZ. Please use the forums and IRC channel to meet for multiplayer games.
sorry, ggz is dead :/ CANTFIX