diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index 1c08714329..207cd615ff 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -330,9 +330,18 @@ private
   end
 
   class <<self
-    attr_reader :url, :version, :homepage, :head, :deps
-    attr_reader *CHECKSUM_TYPES
-
+    def self.attr_rw(*attrs)
+      attrs.each do |attr|
+        class_eval %Q{
+          def #{attr}(val=nil)
+            val.nil? ? @#{attr} : @#{attr} = val
+          end
+        }
+      end
+    end
+    
+    attr_rw :url, :version, :homepage, :head, :deps, *CHECKSUM_TYPES
+    
     def depends_on name, *args
       @deps ||= []
 
diff --git a/Library/Homebrew/unittest.rb b/Library/Homebrew/unittest.rb
index 15336ebdeb..41ebfb173c 100755
--- a/Library/Homebrew/unittest.rb
+++ b/Library/Homebrew/unittest.rb
@@ -75,8 +75,8 @@ class TestBallOverrideBrew <Formula
 end
 
 class TestScriptFileFormula <ScriptFileFormula
-  @url="file:///#{Pathname.new(ABS__FILE__).realpath}"
-  @version="1"
+  url "file:///#{Pathname.new(ABS__FILE__).realpath}"
+  version "1"
   
   def initialize
     super