It's no biggie, I'm using a previous version from graphicall that's still compatible, but if I try to install it on the latest SVN compiled in Ubuntu it won't allow checking it in render addons. (It also happened with one of the latest graphicall builds under windows).
It's a shame that the API is still changing so much, it keeps breaking stuff at all levels
I hope official 2.57 release stabilizes this.
Regards,
Alvaro