Replace the build object rather than mutate it

1 files changed, 3 insertions, 4 deletions

diff --git a/Library/Homebrew/dependency.rb b/Library/Homebrew/dependency.rb
index d3e8b607a..dfb337446 100644
--- a/Library/Homebrew/dependency.rb
+++ b/Library/Homebrew/dependency.rb
@@ -29,10 +29,9 @@ class Dependency
   end
 
   def to_formula
-    f = Formulary.factory(name)
-    # Add this dependency's options to the formula's build args
-    f.build.args = f.build.args.concat(options)
-    f
+    formula = Formulary.factory(name)
+    formula.build = BuildOptions.new(options, formula.options)
+    formula
   end
 
   def installed?