Just posted by Kenneth Reitz:
This is an incredible day for the Homebrew community. You can now setup a
complete OS X develop environment with a single 171.7 MB package download.
It’s official. It’s legal. It’ll be maintained.
Homebrew is going to officially support the package too.
I found this while trying to get Homebrew to work after updating to the
freshly released Xcode 4.3 downloaded from the App Store.
Apple goes on record to support Homebrew. Curiouser and curiouser.