diff --git a/Library/Homebrew/build.rb b/Library/Homebrew/build.rb
index bb4325e5bd..6d812ea68d 100755
--- a/Library/Homebrew/build.rb
+++ b/Library/Homebrew/build.rb
@@ -34,7 +34,7 @@ def main
 
   require 'hardware'
   require 'keg'
-  require 'superenv'
+  require 'extend/ENV'
 
   # Force any future invocations of sudo to require the user's password to be
   # re-entered. This is in-case any build script call sudo. Certainly this is
diff --git a/Library/Homebrew/cmd/--env.rb b/Library/Homebrew/cmd/--env.rb
index 8cc1b1b407..d0dda1d8bb 100644
--- a/Library/Homebrew/cmd/--env.rb
+++ b/Library/Homebrew/cmd/--env.rb
@@ -1,4 +1,4 @@
-require 'superenv'
+require 'extend/ENV'
 require 'hardware'
 
 module Homebrew extend self
diff --git a/Library/Homebrew/cmd/audit.rb b/Library/Homebrew/cmd/audit.rb
index 492291ab9b..060285d7ef 100644
--- a/Library/Homebrew/cmd/audit.rb
+++ b/Library/Homebrew/cmd/audit.rb
@@ -1,6 +1,6 @@
 require 'formula'
 require 'utils'
-require 'superenv'
+require 'extend/ENV'
 require 'formula_cellar_checks'
 
 module Homebrew extend self
diff --git a/Library/Homebrew/cmd/sh.rb b/Library/Homebrew/cmd/sh.rb
index 5e8f26580a..a1ff30dfcd 100644
--- a/Library/Homebrew/cmd/sh.rb
+++ b/Library/Homebrew/cmd/sh.rb
@@ -1,4 +1,4 @@
-require 'superenv'
+require 'extend/ENV'
 require 'formula'
 
 module Homebrew extend self
diff --git a/Library/Homebrew/extend/ENV.rb b/Library/Homebrew/extend/ENV.rb
index 41850fef8a..5e35bace53 100644
--- a/Library/Homebrew/extend/ENV.rb
+++ b/Library/Homebrew/extend/ENV.rb
@@ -1,4 +1,25 @@
 require 'hardware'
+require 'superenv'
+
+def superenv?
+  return false if MacOS::Xcode.without_clt? && MacOS.sdk_path.nil?
+  return false unless Superenv.bin && Superenv.bin.directory?
+  return false if ARGV.include? "--env=std"
+  true
+end
+
+module EnvActivation
+  def activate_extensions!
+    if superenv?
+      extend(Superenv)
+    else
+      extend(HomebrewEnvExtension)
+      prepend 'PATH', "#{HOMEBREW_PREFIX}/bin", ':' unless ORIGINAL_PATHS.include? HOMEBREW_PREFIX/'bin'
+    end
+  end
+end
+
+ENV.extend(EnvActivation)
 
 module HomebrewEnvExtension
   SAFE_CFLAGS_FLAGS = "-w -pipe"
diff --git a/Library/Homebrew/requirement.rb b/Library/Homebrew/requirement.rb
index f710fd0215..0e021a959a 100644
--- a/Library/Homebrew/requirement.rb
+++ b/Library/Homebrew/requirement.rb
@@ -1,6 +1,7 @@
 require 'dependable'
 require 'dependency'
 require 'build_environment'
+require 'extend/ENV'
 
 # A base class for non-formula requirements needed by formulae.
 # A "fatal" requirement is one that will fail the build if it is not present.
@@ -117,7 +118,6 @@ class Requirement
       if instance_variable_defined?(:@satisfied)
         @satisfied
       elsif @options[:build_env]
-        require 'superenv'
         ENV.with_build_environment do
           ENV.userpaths!
           yield @proc
diff --git a/Library/Homebrew/superenv.rb b/Library/Homebrew/superenv.rb
index 17ffddd08d..3fb42b74b5 100644
--- a/Library/Homebrew/superenv.rb
+++ b/Library/Homebrew/superenv.rb
@@ -1,4 +1,3 @@
-require 'extend/ENV'
 require 'macos'
 
 ### Why `superenv`?
@@ -11,26 +10,6 @@ require 'macos'
 # 7) Simpler formula that *just work*
 # 8) Build-system agnostic configuration of the tool-chain
 
-def superenv?
-  return false if MacOS::Xcode.without_clt? && MacOS.sdk_path.nil?
-  return false unless Superenv.bin && Superenv.bin.directory?
-  return false if ARGV.include? "--env=std"
-  true
-end
-
-module EnvActivation
-  def activate_extensions!
-    if superenv?
-      extend(Superenv)
-    else
-      extend(HomebrewEnvExtension)
-      prepend 'PATH', "#{HOMEBREW_PREFIX}/bin", ':' unless ORIGINAL_PATHS.include? HOMEBREW_PREFIX/'bin'
-    end
-  end
-end
-
-ENV.extend(EnvActivation)
-
 module Superenv
   attr_accessor :keg_only_deps, :deps, :x11
   alias_method :x11?, :x11