Build error with latests change

[Henri Gomez]

> Both should be able to compile the macosx-port equally well. If not, it's either a bug we need to fix in the macosx-port, or a bug with Xcode 4 which should be filed at <http://bugreporter.apple.com>. We expect to be able to use the Xcode 3.x series to build for Mac OS X 10.6 Snow Leopard, and do not anticipate requiring Xcode 4.x.

Thanks, I was wondering if switching to XCode 4 couldn't broke builds