From: Samuel Sam <samuel13_666@...>
Date: 2010-09-27T16:48:29+09:00
Subject: Re: error "copyplist failed with exit code 127"

And here we go, problem solved. Instead of searching for hours how to 
modify these paths, I just copied the "plutil" script to 
/developer/usr/bin. It's working perfectly.
Apparently XCode does use it's own path variables that are different 
from the one in "environment.plist"

So, you guys were right, that's not a ruby problem but an XCode one.
Again thanks for your advice ;)
Enjoy.
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