Having looked at the actual code, we could use a little touch up.
http://www.math.columbia.edu/~bayer/OSX/Perforce/

is a somewhat old but good source for XCode developers.

"p4files:
#! /bin/bash

find . -type f -print | egrep -v '^\./build/|\.DS_Store$|~\.nib' | rev | sort | rev "

or getting developers to keep the build folder out of the source!