In principle versions supporting 10.6 target should be buildable for PowerPC with some fixes (SDK is not identical to 10.6.8, but somewhat in between 10.5.8 and 10.6), but I have tried a few old versions from commits here, and looks like Xibs are broken. It is not something I know how to fix. Would be easier to know a buildable version, and then start from there.
In principle versions supporting 10.6 target should be buildable for PowerPC with some fixes (SDK is not identical to 10.6.8, but somewhat in between 10.5.8 and 10.6), but I have tried a few old versions from commits here, and looks like Xibs are broken. It is not something I know how to fix. Would be easier to know a buildable version, and then start from there.