diff --git a/Library/Contributions/cmd/brew-test-bot.rb b/Library/Contributions/cmd/brew-test-bot.rb
index 8dc327484e..adcaf3d191 100755
--- a/Library/Contributions/cmd/brew-test-bot.rb
+++ b/Library/Contributions/cmd/brew-test-bot.rb
@@ -20,7 +20,6 @@
 # --ci-testing-upload: Homebrew CI testing bottle upload.
 
 require 'formula'
-require 'extend/ENV'
 require 'utils'
 require 'date'
 require 'rexml/document'
diff --git a/Library/Homebrew/compilers.rb b/Library/Homebrew/compilers.rb
index e603220606..2d9bb908fa 100644
--- a/Library/Homebrew/compilers.rb
+++ b/Library/Homebrew/compilers.rb
@@ -1,3 +1,8 @@
+module CompilerConstants
+  GNU_GCC_VERSIONS = 3..9
+  GNU_GCC_REGEXP = /gcc-(4\.[3-9])/
+end
+
 class Compiler < Struct.new(:name, :version, :priority)
   # The major version for non-Apple compilers. Used to indicate a compiler
   # series; for instance, if the version is 4.8.2, it would return "4.8".
@@ -93,7 +98,7 @@ class CompilerSelector
     end
 
     # non-Apple GCC 4.x
-    SharedEnvExtension::GNU_GCC_VERSIONS.each do |v|
+    CompilerConstants::GNU_GCC_VERSIONS.each do |v|
       name = "gcc-4.#{v}"
       version = @versions.non_apple_gcc_version(name)
       unless version.nil?
diff --git a/Library/Homebrew/cxxstdlib.rb b/Library/Homebrew/cxxstdlib.rb
index 7525f6ab96..0fc9beacc2 100644
--- a/Library/Homebrew/cxxstdlib.rb
+++ b/Library/Homebrew/cxxstdlib.rb
@@ -1,3 +1,5 @@
+require "compilers"
+
 class CxxStdlib
   attr_accessor :type, :compiler
 
@@ -11,7 +13,7 @@ class CxxStdlib
   end
 
   def apple_compiler?
-    not compiler.to_s =~ SharedEnvExtension::GNU_GCC_REGEXP
+    not compiler.to_s =~ CompilerConstants::GNU_GCC_REGEXP
   end
 
   def compatible_with?(other)
@@ -24,8 +26,8 @@ class CxxStdlib
     # libstdc++ is compatible across Apple compilers, but
     # not between Apple and GNU compilers, or between GNU compiler versions
     return false if apple_compiler? && !other.apple_compiler?
-    if compiler.to_s =~ SharedEnvExtension::GNU_GCC_REGEXP
-      return false unless other.compiler.to_s =~ SharedEnvExtension::GNU_GCC_REGEXP
+    if compiler.to_s =~ CompilerConstants::GNU_GCC_REGEXP
+      return false unless other.compiler.to_s =~ CompilerConstants::GNU_GCC_REGEXP
       return false unless compiler.to_s[4..6] == other.compiler.to_s[4..6]
     end
 
diff --git a/Library/Homebrew/extend/ENV/shared.rb b/Library/Homebrew/extend/ENV/shared.rb
index 8208d185d1..9225b997f6 100644
--- a/Library/Homebrew/extend/ENV/shared.rb
+++ b/Library/Homebrew/extend/ENV/shared.rb
@@ -1,17 +1,18 @@
-require 'formula'
+require "formula"
+require "compilers"
 
 module SharedEnvExtension
+  include CompilerConstants
+
   CC_FLAG_VARS = %w{CFLAGS CXXFLAGS OBJCFLAGS OBJCXXFLAGS}
   FC_FLAG_VARS = %w{FCFLAGS FFLAGS}
 
-  # Update these every time a new GNU GCC branch is released
-  GNU_GCC_VERSIONS = (3..9)
-  GNU_GCC_REGEXP = /gcc-(4\.[3-9])/
-
-  COMPILER_SYMBOL_MAP = { 'gcc-4.0'  => :gcc_4_0,
-                          'gcc-4.2'  => :gcc,
-                          'llvm-gcc' => :llvm,
-                          'clang'    => :clang }
+  COMPILER_SYMBOL_MAP = {
+    "gcc-4.0"  => :gcc_4_0,
+    "gcc-4.2"  => :gcc,
+    "llvm-gcc" => :llvm,
+    "clang"    => :clang,
+  }
 
   COMPILERS = COMPILER_SYMBOL_MAP.values +
     GNU_GCC_VERSIONS.map { |n| "gcc-4.#{n}" }