Sorry for the slow reply to your post.
Please note: I don't have any access to a mac of any kind, but I can offer you some advice on how to compile.
First you need ensure that mac has 3d hardware graphical acceleration as PB depends on this using OpenGl.
Second you need to find a version of QT that compiles on your system. go to
http://qt.nokia.com/ and find if there is a version that works on your system. I suggest that first compile the example openGL/"Hello GL". If you can get that working on your system them PB should compile as well.
PB works with quite old versions of the QT library if the new versions of QT don't run on your system.
Please let us know how you get on.
Thanks
Louis