diff --git a/Library/Homebrew/utils.rb b/Library/Homebrew/utils.rb
index 74d5d0f916..e5d7fa81a1 100644
--- a/Library/Homebrew/utils.rb
+++ b/Library/Homebrew/utils.rb
@@ -8,7 +8,7 @@ class Tty
     def yellow; underline 33 ; end
     def reset; escape 0; end
     def em; underline 39; end
-    
+
   private
     def color n
       escape "0;#{n}"
@@ -330,6 +330,10 @@ module MacOS extend self
     10.6 <= MACOS_VERSION # Actually Snow Leopard or newer
   end
 
+  def lion?
+    10.7 == MACOS_VERSION
+  end
+
   def prefer_64_bit?
     Hardware.is_64_bit? and 10.6 <= MACOS_VERSION
   end