diff --git a/Library/Homebrew/cmd/sh.rb b/Library/Homebrew/cmd/sh.rb
index 3720124b7e..11f57b6601 100644
--- a/Library/Homebrew/cmd/sh.rb
+++ b/Library/Homebrew/cmd/sh.rb
@@ -13,7 +13,7 @@ module Homebrew
     ENV.activate_extensions!
 
     if superenv?
-      ENV.x11 = MacOS::X11.installed?
+      ENV.set_x11_env_if_installed
       ENV.deps = Formula.installed.select { |f| f.keg_only? && f.opt_prefix.directory? }
     end
     ENV.setup_build_environment
diff --git a/Library/Homebrew/extend/ENV/super.rb b/Library/Homebrew/extend/ENV/super.rb
index 25ee5c0aa3..1590b013c7 100644
--- a/Library/Homebrew/extend/ENV/super.rb
+++ b/Library/Homebrew/extend/ENV/super.rb
@@ -27,10 +27,6 @@ module Superenv
 
   # @private
   def self.bin
-    return unless DevelopmentTools.installed?
-
-    bin = HOMEBREW_ENV_PATH.subdirs.reject { |d| d.basename.to_s > MacOS::Xcode.version }.max
-    bin.realpath unless bin.nil?
   end
 
   def reset
@@ -56,7 +52,6 @@ module Superenv
     self["HOMEBREW_CELLAR"] = HOMEBREW_CELLAR.to_s
     self["HOMEBREW_OPT"] = "#{HOMEBREW_PREFIX}/opt"
     self["HOMEBREW_TEMP"] = HOMEBREW_TEMP.to_s
-    self["HOMEBREW_SDKROOT"] = effective_sysroot
     self["HOMEBREW_OPTFLAGS"] = determine_optflags
     self["HOMEBREW_ARCHFLAGS"] = ""
     self["CMAKE_PREFIX_PATH"] = determine_cmake_prefix_path
@@ -73,15 +68,6 @@ module Superenv
       self["HOMEBREW_FORMULA_PREFIX"] = formula.prefix
     end
 
-    if MacOS::Xcode.without_clt? || (MacOS::Xcode.installed? && MacOS::Xcode.version.to_i >= 7)
-      self["MACOSX_DEPLOYMENT_TARGET"] = MacOS.version.to_s
-      self["SDKROOT"] = MacOS.sdk_path
-    end
-
-    # On 10.9, the tools in /usr/bin proxy to the active developer directory.
-    # This means we can use them for any combination of CLT and Xcode.
-    self["HOMEBREW_PREFER_CLT_PROXIES"] = "1" if MacOS.version >= "10.9"
-
     # The HOMEBREW_CCCFG ENV variable is used by the ENV/cc tool to control
     # compiler flag stripping. It consists of a string of characters which act
     # as flags. Some of these flags are mutually exclusive.
@@ -97,6 +83,7 @@ module Superenv
     # s - apply fix for sed's Unicode support
     # a - apply fix for apr-1-config path
   end
+  alias_method :generic_setup_build_environment, :setup_build_environment
 
   private
 
@@ -109,27 +96,23 @@ module Superenv
   end
 
   def effective_sysroot
-    MacOS::Xcode.without_clt? ? MacOS.sdk_path.to_s : nil
   end
 
   def determine_cxx
     determine_cc.to_s.gsub("gcc", "g++").gsub("clang", "clang++")
   end
 
+  def homebrew_extra_paths
+    []
+  end
+
   def determine_path
     paths = [Superenv.bin]
 
     # Formula dependencies can override standard tools.
     paths += deps.map { |d| d.opt_bin.to_s }
 
-    # On 10.9, there are shims for all tools in /usr/bin.
-    # On 10.7 and 10.8 we need to add these directories ourselves.
-    if MacOS::Xcode.without_clt? && MacOS.version <= "10.8"
-      paths << "#{MacOS::Xcode.prefix}/usr/bin"
-      paths << "#{MacOS::Xcode.toolchain_path}/usr/bin"
-    end
-
-    paths << MacOS::X11.bin.to_s if x11?
+    paths += homebrew_extra_paths
     paths += %w[/usr/bin /bin /usr/sbin /sbin]
 
     # Homebrew's apple-gcc42 will be outside the PATH in superenv,
@@ -149,6 +132,10 @@ module Superenv
     paths.to_path_s
   end
 
+  def homebrew_extra_pkg_config_paths
+    []
+  end
+
   def determine_pkg_config_path
     paths  = deps.map { |d| "#{d.opt_lib}/pkgconfig" }
     paths += deps.map { |d| "#{d.opt_share}/pkgconfig" }
@@ -156,25 +143,29 @@ module Superenv
   end
 
   def determine_pkg_config_libdir
-    paths = %W[/usr/lib/pkgconfig #{HOMEBREW_ENV_PATH}/pkgconfig/#{MacOS.version}]
-    paths << "#{MacOS::X11.lib}/pkgconfig" << "#{MacOS::X11.share}/pkgconfig" if x11?
+    paths = %W[/usr/lib/pkgconfig]
+    paths += homebrew_extra_pkg_config_paths
     paths.to_path_s
   end
 
+  def homebrew_extra_aclocal_paths
+    []
+  end
+
   def determine_aclocal_path
     paths = keg_only_deps.map { |d| "#{d.opt_share}/aclocal" }
     paths << "#{HOMEBREW_PREFIX}/share/aclocal"
-    paths << "#{MacOS::X11.share}/aclocal" if x11?
+    paths += homebrew_extra_aclocal_paths
     paths.to_path_s
   end
 
+  def homebrew_extra_isystem_paths
+    []
+  end
+
   def determine_isystem_paths
-    paths = []
-    paths << "#{HOMEBREW_PREFIX}/include"
-    paths << "#{effective_sysroot}/usr/include/libxml2" unless deps.any? { |d| d.name == "libxml2" }
-    paths << "#{effective_sysroot}/usr/include/apache2" if MacOS::Xcode.without_clt?
-    paths << MacOS::X11.include.to_s << "#{MacOS::X11.include}/freetype2" if x11?
-    paths << "#{effective_sysroot}/System/Library/Frameworks/OpenGL.framework/Versions/Current/Headers"
+    paths = ["#{HOMEBREW_PREFIX}/include"]
+    paths += homebrew_extra_isystem_paths
     paths.to_path_s
   end
 
@@ -182,11 +173,13 @@ module Superenv
     keg_only_deps.map { |d| d.opt_include.to_s }.to_path_s
   end
 
+  def homebrew_extra_library_paths
+    []
+  end
+
   def determine_library_paths
     paths = keg_only_deps.map { |d| d.opt_lib.to_s }
-    paths << "#{HOMEBREW_PREFIX}/lib"
-    paths << MacOS::X11.lib.to_s if x11?
-    paths << "#{effective_sysroot}/System/Library/Frameworks/OpenGL.framework/Versions/Current/Libraries"
+    paths += homebrew_extra_library_paths
     paths.to_path_s
   end
 
@@ -200,25 +193,34 @@ module Superenv
     paths.to_path_s
   end
 
+  def homebrew_extra_cmake_include_paths
+    []
+  end
+
   def determine_cmake_include_path
     paths = []
     paths << "#{effective_sysroot}/usr/include/libxml2" unless deps.any? { |d| d.name == "libxml2" }
-    paths << "#{effective_sysroot}/usr/include/apache2" if MacOS::Xcode.without_clt?
-    paths << MacOS::X11.include.to_s << "#{MacOS::X11.include}/freetype2" if x11?
-    paths << "#{effective_sysroot}/System/Library/Frameworks/OpenGL.framework/Versions/Current/Headers"
+    paths += homebrew_extra_cmake_include_paths
     paths.to_path_s
   end
 
+  def homebrew_extra_cmake_library_paths
+    []
+  end
+
   def determine_cmake_library_path
     paths = []
-    paths << MacOS::X11.lib.to_s if x11?
-    paths << "#{effective_sysroot}/System/Library/Frameworks/OpenGL.framework/Versions/Current/Libraries"
+    paths += homebrew_extra_cmake_library_paths
     paths.to_path_s
   end
 
+  def homebrew_extra_cmake_frameworks_paths
+    []
+  end
+
   def determine_cmake_frameworks_path
     paths = deps.map { |d| d.opt_frameworks.to_s }
-    paths << "#{effective_sysroot}/System/Library/Frameworks" if MacOS::Xcode.without_clt?
+    paths += homebrew_extra_cmake_frameworks_paths
     paths.to_path_s
   end
 
@@ -245,12 +247,7 @@ module Superenv
   end
 
   def determine_cccfg
-    s = ""
-    # Fix issue with sed barfing on unicode characters on Mountain Lion
-    s << "s" if MacOS.version >= :mountain_lion
-    # Fix issue with >= 10.8 apr-1-config having broken paths
-    s << "a" if MacOS.version >= :mountain_lion
-    s
+    ""
   end
 
   public
@@ -333,19 +330,26 @@ module Superenv
     end
   end
 
+  def set_x11_env_if_installed
+  end
+
   # @private
   def noop(*_args); end
-  noops = []
 
   # These methods are no longer necessary under superenv, but are needed to
   # maintain an interface compatible with stdenv.
-  noops.concat %w[fast O4 Og libxml2 set_cpu_flags macosxsdk remove_macosxsdk]
+  alias_method :fast, :noop
+  alias_method :O4, :noop
+  alias_method :Og, :noop
+  alias_method :libxml2, :noop
+  alias_method :set_cpu_flags, :noop
 
   # These methods provide functionality that has not yet been ported to
   # superenv.
-  noops.concat %w[gcc_4_0_1 minimal_optimization no_optimization enable_warnings]
-
-  noops.each { |m| alias_method m, :noop }
+  alias_method :gcc_4_0_1, :noop
+  alias_method :minimal_optimization, :noop
+  alias_method :no_optimization, :noop
+  alias_method :enable_warnings, :noop
 end
 
 class Array
@@ -353,3 +357,5 @@ class Array
     map(&:to_s).uniq.select { |s| File.directory? s }.join(File::PATH_SEPARATOR).chuzzle
   end
 end
+
+require "extend/os/extend/ENV/super"
diff --git a/Library/Homebrew/extend/os/extend/ENV/super.rb b/Library/Homebrew/extend/os/extend/ENV/super.rb
new file mode 100644
index 0000000000..fd4e93c227
--- /dev/null
+++ b/Library/Homebrew/extend/os/extend/ENV/super.rb
@@ -0,0 +1,5 @@
+require "extend/ENV/super"
+
+if OS.mac?
+  require "extend/os/mac/extend/ENV/super"
+end
diff --git a/Library/Homebrew/extend/os/mac/extend/ENV/super.rb b/Library/Homebrew/extend/os/mac/extend/ENV/super.rb
new file mode 100644
index 0000000000..eacf488134
--- /dev/null
+++ b/Library/Homebrew/extend/os/mac/extend/ENV/super.rb
@@ -0,0 +1,105 @@
+module Superenv
+  # @private
+  def self.bin
+    return unless DevelopmentTools.installed?
+
+    bin = HOMEBREW_ENV_PATH.subdirs.reject { |d| d.basename.to_s > MacOS::Xcode.version }.max
+    bin.realpath unless bin.nil?
+  end
+
+  def homebrew_extra_paths
+    paths = []
+    # On 10.9, there are shims for all tools in /usr/bin.
+    # On 10.7 and 10.8 we need to add these directories ourselves.
+    if MacOS::Xcode.without_clt? && MacOS.version <= "10.8"
+      paths << "#{MacOS::Xcode.prefix}/usr/bin"
+      paths << "#{MacOS::Xcode.toolchain_path}/usr/bin"
+    end
+
+    paths << MacOS::X11.bin.to_s if x11?
+    paths
+  end
+
+  # @private
+  def homebrew_extra_pkg_config_paths
+    paths = ["#{HOMEBREW_ENV_PATH}/pkgconfig/#{MacOS.version}"]
+    paths << "#{MacOS::X11.lib}/pkgconfig" << "#{MacOS::X11.share}/pkgconfig" if x11?
+    paths
+  end
+
+  def homebrew_extra_aclocal_paths
+    paths = []
+    paths << "#{MacOS::X11.share}/aclocal" if x11?
+    paths
+  end
+
+  def homebrew_extra_isystem_paths
+    paths = []
+    paths << "#{effective_sysroot}/usr/include/libxml2" unless deps.any? { |d| d.name == "libxml2" }
+    paths << "#{effective_sysroot}/usr/include/apache2" if MacOS::Xcode.without_clt?
+    paths << MacOS::X11.include.to_s << "#{MacOS::X11.include}/freetype2" if x11?
+    paths << "#{effective_sysroot}/System/Library/Frameworks/OpenGL.framework/Versions/Current/Headers"
+    paths
+  end
+
+  def homebrew_extra_library_paths
+    paths = []
+    paths << MacOS::X11.lib.to_s if x11?
+    paths << "#{effective_sysroot}/System/Library/Frameworks/OpenGL.framework/Versions/Current/Libraries"
+    paths
+  end
+
+  def homebrew_extra_cmake_include_paths
+    paths = []
+    paths << "#{effective_sysroot}/usr/include/apache2" if MacOS::Xcode.without_clt?
+    paths << MacOS::X11.include.to_s << "#{MacOS::X11.include}/freetype2" if x11?
+    paths << "#{effective_sysroot}/System/Library/Frameworks/OpenGL.framework/Versions/Current/Headers"
+    paths
+  end
+
+  def homebrew_extra_cmake_library_paths
+    paths = []
+    paths << MacOS::X11.lib.to_s if x11?
+    paths << "#{effective_sysroot}/System/Library/Frameworks/OpenGL.framework/Versions/Current/Libraries"
+    paths
+  end
+
+  def homebrew_extra_cmake_frameworks_paths
+    paths = []
+    paths << "#{effective_sysroot}/System/Library/Frameworks" if MacOS::Xcode.without_clt?
+    paths
+  end
+
+  def determine_cccfg
+    s = ""
+    # Fix issue with sed barfing on unicode characters on Mountain Lion
+    s << "s" if MacOS.version >= :mountain_lion
+    # Fix issue with >= 10.8 apr-1-config having broken paths
+    s << "a" if MacOS.version >= :mountain_lion
+    s
+  end
+
+  # @private
+  def setup_build_environment(formula = nil)
+    generic_setup_build_environment(formula)
+    self["HOMEBREW_SDKROOT"] = effective_sysroot
+
+    if MacOS::Xcode.without_clt? || (MacOS::Xcode.installed? && MacOS::Xcode.version.to_i >= 7)
+      self["MACOSX_DEPLOYMENT_TARGET"] = MacOS.version.to_s
+      self["SDKROOT"] = MacOS.sdk_path
+    end
+
+    # On 10.9, the tools in /usr/bin proxy to the active developer directory.
+    # This means we can use them for any combination of CLT and Xcode.
+    self["HOMEBREW_PREFER_CLT_PROXIES"] = "1" if MacOS.version >= "10.9"
+  end
+
+  def set_x11_env_if_installed
+    ENV.x11 = MacOS::X11.installed?
+  end
+
+  # These methods are no longer necessary under superenv, but are needed to
+  # maintain an interface compatible with stdenv.
+  alias_method :macosxsdk, :noop
+  alias_method :remove_macosxsdk, :noop
+end