The "stable" version of 1.9.2 was released on 08.18.2010 so it's pretty fresh. I guess we should now start testing if we can install it on our systems and run Gosu on top of it!
I've been using 1.9.2 on windows with Gosu for a while with no problems (installed via a hand-compiled ruby-installer and via pik; I'd highly recommend using pik(Windows)/rvm(!Windows) for installing Ruby). I'll update now it is final though! Thanks!
The KEY change you need to manage is this:
$: (aka $LOAD_PATH) no longer includes the current directory
Well, I just needed to compile the source code on Kubuntu 10.10 and it now works. The steps are included in README file and I just found a couple of them, quite simple indeed.