diff --git a/Library/Homebrew/build_environment.rb b/Library/Homebrew/build_environment.rb
index 618342a407..86a7fef503 100644
--- a/Library/Homebrew/build_environment.rb
+++ b/Library/Homebrew/build_environment.rb
@@ -1,8 +1,6 @@
 require 'set'
 
 class BuildEnvironment
-  attr_accessor :proc
-
   def initialize(*settings)
     @settings = Set.new(*settings)
   end
@@ -24,36 +22,11 @@ class BuildEnvironment
   def userpaths?
     @settings.include? :userpaths
   end
-
-  def modify_build_environment(receiver)
-    receiver.instance_eval(&proc) if self.proc
-  end
-
-  def marshal_dump
-    @settings
-  end
-
-  def marshal_load(data)
-    @settings = data
-  end
-
-  def _dump(*)
-    Marshal.dump(marshal_dump)
-  end
-
-  def self._load(s)
-    new(Marshal.load(s))
-  end
 end
 
 module BuildEnvironmentDSL
-  def env(*settings, &block)
+  def env(*settings)
     @env ||= BuildEnvironment.new
-    if block_given?
-      @env.proc = block
-    else
-      @env.merge(settings)
-    end
-    @env
+    @env.merge(settings)
   end
 end
diff --git a/Library/Homebrew/test/test_build_environment.rb b/Library/Homebrew/test/test_build_environment.rb
index bd8c834519..879d450477 100644
--- a/Library/Homebrew/test/test_build_environment.rb
+++ b/Library/Homebrew/test/test_build_environment.rb
@@ -23,31 +23,6 @@ class BuildEnvironmentTests < Homebrew::TestCase
     @env << :userpaths
     assert_predicate @env, :userpaths?
   end
-
-  def test_modify_build_environment
-    @env.proc = Proc.new { raise StandardError }
-    assert_raises(StandardError) do
-      @env.modify_build_environment(self)
-    end
-  end
-
-  def test_marshal
-    @env << :userpaths
-    @env.proc = Proc.new {}
-    assert_predicate Marshal.load(Marshal.dump(@env)), :userpaths?
-  end
-
-  def test_env_block
-    error = Class.new(StandardError)
-    @env.proc = Proc.new { raise error }
-    assert_raises(error) { @env.modify_build_environment(self) }
-  end
-
-  def test_env_block_with_argument
-    error = Class.new(StandardError)
-    @env.proc = Proc.new { |x| raise x }
-    assert_raises(error) { @env.modify_build_environment(error) }
-  end
 end
 
 class BuildEnvironmentDSLTests < Homebrew::TestCase