1 files changed, 9 insertions, 0 deletions
diff --git a/Library/Homebrew/formula_support.rb b/Library/Homebrew/formula_support.rb
index f72358d4d..9f30afbf7 100644
--- a/Library/Homebrew/formula_support.rb
+++ b/Library/Homebrew/formula_support.rb
@@ -185,6 +185,7 @@ end
 # This class holds the build-time options defined for a Formula,
 # and provides named access to those options during install.
 class BuildOptions
+  attr_writer :args
   include Enumerable
 
   def initialize args
@@ -253,4 +254,12 @@ class BuildOptions
   def build_32_bit?
     @args.include? '--32-bit'
   end
+
+  def used_options
+    as_flags & @args.options_only
+  end
+
+  def unused_options
+    as_flags - @args.options_only
+  end
 end