I do know this have nothing related with that problem (because it is related to squirrel), but with the software on which I am currently working on, gcc4.7 was not able to compile wxWidgets 2.9.3, but it was fixed in the trunk, so if someone want to compile it and wxWidgets himself, he could have to compile wxWidgets from trunk version.
Since I guess that C::B have big dependencies on wxWidgets, there might be some other things to fix for people which try to use wxWidgets 2.9
Really, I am not sure this reply will help someone, but...