My worry about building the G4 version is that the processor in the G4 is too slow for Skype.
What OS are you running (Leopard or Tiger?) I can build the programs and post them if you'd like. It might take me a week or so depending on what version of OS X you are running. I have a Leopard, Tiger and a Panther machine lying around I think (may not have Panther which is 10.3).