well I'm not able to figure out the details needed to compile your groupcoin or bitcoin-qt,  I just get warnings and nothing seems to build.  I think I have all the needed libs installed on Ubuntu 10.04.  Other than that you can take a look at the configs for Multicoin that you can use as a reference or just use as a  branch point  to continue development.  I think I prefer Qt as a user so eather way is cool for me.  the link to a posible config can be found at: http://exchange.beertokens.info/docs/multicoin/bitcoin.conf.groupcoin  that I have tested with MultiCoin https://github.com/sacarlson/MultiCoin  I have test mined it and am now at block 54.  If you want to try link into it and try it you can addnode=www.beertokens.info, and dns=1.  I don't have the IRC active at this time.