diff --git a/Library/Homebrew/extend/ENV.rb b/Library/Homebrew/extend/ENV.rb
index 91c379c908..f311d14ee9 100644
--- a/Library/Homebrew/extend/ENV.rb
+++ b/Library/Homebrew/extend/ENV.rb
@@ -1,4 +1,5 @@
 require 'hardware'
+require 'extend/ENV/shared'
 require 'extend/ENV/super'
 
 def superenv?
@@ -21,9 +22,9 @@ end
 ENV.extend(EnvActivation)
 
 module HomebrewEnvExtension
+  include SharedEnvExtension
+
   SAFE_CFLAGS_FLAGS = "-w -pipe"
-  CC_FLAG_VARS = %w{CFLAGS CXXFLAGS OBJCFLAGS OBJCXXFLAGS}
-  FC_FLAG_VARS = %w{FCFLAGS FFLAGS}
   DEFAULT_FLAGS = '-march=core2 -msse4'
 
   def self.extended(base)
@@ -403,119 +404,3 @@ module HomebrewEnvExtension
     append "LDFLAGS", "-B#{ld64.bin.to_s+"/"}"
   end
 end
-
-class << ENV
-  def remove_cc_etc
-    keys = %w{CC CXX OBJC OBJCXX LD CPP CFLAGS CXXFLAGS OBJCFLAGS OBJCXXFLAGS LDFLAGS CPPFLAGS}
-    removed = Hash[*keys.map{ |key| [key, self[key]] }.flatten]
-    keys.each do |key|
-      delete(key)
-    end
-    removed
-  end
-  def append_to_cflags newflags
-    append(HomebrewEnvExtension::CC_FLAG_VARS, newflags)
-  end
-  def remove_from_cflags val
-    remove HomebrewEnvExtension::CC_FLAG_VARS, val
-  end
-  def append keys, value, separator = ' '
-    value = value.to_s
-    Array(keys).each do |key|
-      unless self[key].to_s.empty?
-        self[key] = self[key] + separator + value.to_s
-      else
-        self[key] = value.to_s
-      end
-    end
-  end
-  def prepend keys, value, separator = ' '
-    Array(keys).each do |key|
-      unless self[key].to_s.empty?
-        self[key] = value.to_s + separator + self[key]
-      else
-        self[key] = value.to_s
-      end
-    end
-  end
-  def prepend_path key, path
-    prepend key, path, ':' if File.directory? path
-  end
-  def remove keys, value
-    Array(keys).each do |key|
-      next unless self[key]
-      self[key] = self[key].sub(value, '')
-      delete(key) if self[key].to_s.empty?
-    end if value
-  end
-
-  def cc;       self['CC'] or "cc";   end
-  def cxx;      self['CXX'] or "c++"; end
-  def cflags;   self['CFLAGS'];       end
-  def cxxflags; self['CXXFLAGS'];     end
-  def cppflags; self['CPPFLAGS'];     end
-  def ldflags;  self['LDFLAGS'];      end
-  def fc;       self['FC'];           end
-  def fflags;   self['FFLAGS'];       end
-  def fcflags;  self['FCFLAGS'];      end
-
-  # Snow Leopard defines an NCURSES value the opposite of most distros
-  # See: http://bugs.python.org/issue6848
-  # Currently only used by aalib in core
-  def ncurses_define
-    append 'CPPFLAGS', "-DNCURSES_OPAQUE=0"
-  end
-
-  def userpaths!
-    paths = ORIGINAL_PATHS.map { |p| p.realpath.to_s rescue nil } - %w{/usr/X11/bin /opt/X11/bin}
-    self['PATH'] = paths.unshift(*self['PATH'].split(":")).uniq.join(":")
-    # XXX hot fix to prefer brewed stuff (e.g. python) over /usr/bin.
-    prepend 'PATH', HOMEBREW_PREFIX/'bin', ':'
-  end
-
-  def with_build_environment
-    old_env = to_hash
-    setup_build_environment
-    yield
-  ensure
-    replace(old_env)
-  end
-
-  def fortran
-    # superenv removes these PATHs, but this option needs them
-    # TODO fix better, probably by making a super-fc
-    self['PATH'] += ":#{HOMEBREW_PREFIX}/bin:/usr/local/bin"
-
-    if self['FC']
-      ohai "Building with an alternative Fortran compiler"
-      puts "This is unsupported."
-      self['F77'] ||= self['FC']
-
-      if ARGV.include? '--default-fortran-flags'
-        flags_to_set = []
-        flags_to_set << 'FCFLAGS' unless self['FCFLAGS']
-        flags_to_set << 'FFLAGS' unless self['FFLAGS']
-        flags_to_set.each {|key| self[key] = cflags}
-        set_cpu_flags(flags_to_set)
-      elsif not self['FCFLAGS'] or self['FFLAGS']
-        opoo <<-EOS.undent
-          No Fortran optimization information was provided.  You may want to consider
-          setting FCFLAGS and FFLAGS or pass the `--default-fortran-flags` option to
-          `brew install` if your compiler is compatible with GCC.
-
-          If you like the default optimization level of your compiler, ignore this
-          warning.
-        EOS
-      end
-
-    elsif which 'gfortran'
-      ohai "Using Homebrew-provided fortran compiler."
-      puts "This may be changed by setting the FC environment variable."
-      self['FC'] = which 'gfortran'
-      self['F77'] = self['FC']
-
-      HomebrewEnvExtension::FC_FLAG_VARS.each {|key| self[key] = cflags}
-      set_cpu_flags(HomebrewEnvExtension::FC_FLAG_VARS)
-    end
-  end
-end
diff --git a/Library/Homebrew/extend/ENV/super.rb b/Library/Homebrew/extend/ENV/super.rb
index b3a14fdd3e..5bfa34437c 100644
--- a/Library/Homebrew/extend/ENV/super.rb
+++ b/Library/Homebrew/extend/ENV/super.rb
@@ -1,4 +1,5 @@
 require 'macos'
+require 'extend/ENV/shared'
 
 ### Why `superenv`?
 # 1) Only specify the environment we need (NO LDFLAGS for cmake)
@@ -11,6 +12,8 @@ require 'macos'
 # 8) Build-system agnostic configuration of the tool-chain
 
 module Superenv
+  include SharedEnvExtension
+
   attr_accessor :keg_only_deps, :deps, :x11
   alias_method :x11?, :x11