First try what Gid15 said and make sure everything is running 32bit.
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Since I don't own a mac, I can't really say for sure but If you are running "Lion" they disabled PPC executable support in this new OS,
I'm not 100% sure but if the mac build of xuggle was compiled as an PPC executable then it's possible that the xuggle build wont work until someone makes a native module that lion can understand.
(I looked under the xuggle build files and saw this 'macppc')
So the best option for now might be to disable the media engine in jpcsp.
(of course you could always install bootcamp and install the Windows OS and dual boot for jpcsp)
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Since I don't own a mac, I can't really say for sure but If you are running "Lion" they disabled PPC executable support in this new OS,
I'm not 100% sure but if the mac build of xuggle was compiled as an PPC executable then it's possible that the xuggle build wont work until someone makes a native module that lion can understand.
(I looked under the xuggle build files and saw this 'macppc')
So the best option for now might be to disable the media engine in jpcsp.
(of course you could always install bootcamp and install the Windows OS and dual boot for jpcsp)
Try Out JPCSP Launcher v1.8.0.4 | How to post a log