The BuildProcess webpage says it builds to /tmp on OSX. It's not there. It's in /var/folders/-B/-BPrY4S8FLSKzjcf+THsNk+++TM/-Tmp-/build6711536341655330731.tmp
on my mac running Arduino 21, Mac OS X 10.6.5
Please correct docs. Those folder names appear to be different on every user's mac BTW. might want to provide some sort of link to the build dir.