Install SaltStack (http://saltstack.org/) on OS X using Homebrew. Salt has native dependencies that are already in Homebrew, and I wanted to make it easier to install. I doubt this will make it into the official Homebrew formulas.

saltstack.rb

require 'formula'

class Saltstack < Formula
  homepage 'http://saltstack.org'
  url 'https://github.com/saltstack/salt/archive/v0.13.1.zip'
  sha1 '56ee585b42c9f45330fb76f5a3c4bd2259a116a0'

  depends_on 'libyaml'
  depends_on 'msgpack'
  depends_on 'swig' => :build
  depends_on 'zeromq'
  depends_on LanguageModuleDependency.new :python, 'distribute', 'setuptools'


  def install
    # In order to install into the Cellar, the dir must exist and be in the PYTHONPATH.
    temp_site_packages = 'lib/#{which_python}/site-packages'
    mkdir_p temp_site_packages
    ENV['PYTHONPATH'] = temp_site_packages
    
    args = [
      "--no-user-cfg",
      "--verbose",
      "install",
      "--force",
      "--install-scripts=#{bin}",
      "--install-lib=#{temp_site_packages}",
      "--install-data=#{share}",
      "--install-headers=#{include}",
    ]

    # Required specifically for SaltStack
    ENV["USE_SETUPTOOLS"] = "True"
    system "python", "-s", "setup.py", *args
    
    # Homebrew already includes distribute for us, so these files are extraneous.
    rm_f temp_site_packages/'site.py'
    rm_f temp_site_packages/'site.pyc'
    rm_f temp_site_packages/'easy-install.pth'
  end

  def which_python
    # Update this once we have something like [this](https://github.com/mxcl/homebrew/issues/11204)
    "python" + `python -c 'import sys;print(sys.version[:3])'`.strip
  end

end