Adding the formula for MESS

This formula builds MESS, the Multi Emulator Super System.

Library/Formula/mess.rb

@@ -0,0 +1,28 @@
+require 'formula'
+
+class Mess < Formula
+  url 'svn://messdev.no-ip.org/mess', :revision => 15603
+  head 'svn://messdev.no-ip.org/mess'
+  homepage 'http://www.mess.org/'
+  version '146u3'
+
+  depends_on :x11
+  depends_on 'sdl'
+
+  def install
+    ENV['MACOSX_USE_LIBSDL'] = '1'
+    ENV['INCPATH'] = '-I./src/lib/util -I/usr/X11/include'
+    ENV['PTR64'] = if MacOS.prefer_64_bit? then '0' else '1' end
+
+    system 'make' # Builds MESS
+    if MacOS.prefer_64_bit?
+      bin.install 'mess64' => 'mess'
+    else
+      bin.install 'mess'
+    end
+  end
+
+  def test
+    system "mess -h"
+  end
+end