This is a Mac OS Homebrew Tap (third party repository) for astroidmail on OSX.
Once you have Homebrew running, it should be as easy as:
$ brew tap astroidmail/astroid
You can then install with
$ brew install astroid [--HEAD]
which will also pull down a webkit dependency as a bottle. If you choose --build-from-source then you will have to wait a long time to compile, and you may have some issues we won't support :)