Darwin community,
as you might have experienced, the current published sources of some Darwin 9 projects, including such essential ones as IOKitUser, launchd, objc4 currently have build- or runtime dependencies on projects that are not part of Darwin.
It looks like patching the respective sources to remove the non-Darwin dependencies is the most pragmatic approach at this time. Hence, Aladin from the PureDarwin project has made available a series of patches.
Read the full post on the darwin-dev mailing list at http://lists.apple.com/archives/darwin-dev//2008/Oct/msg00132.html