There are a number of problems building the tree on OS X 10.7, which aren't encountered on earlier versions of OS X. I've opened this bug to help keep track of them.
Bug 659881 can also happen building on OS X 10.6.X.
Can we close this now? I'm building fine afaict with no extra patches applied and it doesn't seem like any new blockers for this have been added.
Actually my workaround for bug 655339 has come unglued a bit (see particularly bug 655339 comment #60). I haven't yet had a chance to get back to it.
I'm going to go ahead and close this since bug 655399 is closed and while there may be a lingering issue, it doesn't seem to have hit anybody recently. And I don't like stale bugs :)