Install SDL, SDL_image, SDL_net, SDL_ttf and SDL_mixer using your distribution's package manager (i.e. apt, yum, yast etc...)
In a terminal type the following commands
If everything went right you can finally use gccg_package to install the game modules
View the list available modules
Install game modules you wish to play
./gccg_package install <game>
where <game> may be lotr, metw, mtg or pokemon
Each game module has a startup script with the same name as the module, with capitalized first letter. You can launch the game using it.
i.e. for metw module
Also card images can be installed using the gccg_package.
i.e. to install metw card images run
./gccg_package install metw-cards*
To update all installed packages, do: