gforth homebrew formula -- works for me

gforth.rb

require 'formula'

class Gforth < Formula
  url 'http://www.complang.tuwien.ac.at/forth/gforth/gforth-0.7.0.tar.gz'
  homepage 'http://www.jwdt.com/~paysan/gforth.html'
  sha1 '5bb357268cba683f2a8c63d2a4bcab8f41cb0086'

  def install
    ENV.j1 # Parallel builds won't work
    system "./configure", "x86_64-apple-darwin10.0.0"
    system "make" # Separate build steps.
    system "make install"
  end
end