diff --git a/Library/Homebrew/extend/ENV/std.rb b/Library/Homebrew/extend/ENV/std.rb
index caf0471e86..204b636a28 100644
--- a/Library/Homebrew/extend/ENV/std.rb
+++ b/Library/Homebrew/extend/ENV/std.rb
@@ -72,9 +72,9 @@ module Stdenv
     # For Xcode 4.3 (*without* the "Command Line Tools for Xcode") compiler and tools inside of Xcode:
     if not MacOS::CLT.installed? and MacOS::Xcode.installed? and MacOS::Xcode.version >= "4.3"
       # Some tools (clang, etc.) are in the xctoolchain dir of Xcode
-      append 'PATH', "#{MacOS.xctoolchain_path}/usr/bin", File::PATH_SEPARATOR if MacOS.xctoolchain_path
+      append_path 'PATH', "#{MacOS.xctoolchain_path}/usr/bin" if MacOS.xctoolchain_path
       # Others are now at /Applications/Xcode.app/Contents/Developer/usr/bin
-      append 'PATH', "#{MacOS.dev_tools_path}", File::PATH_SEPARATOR
+      append_path 'PATH', MacOS.dev_tools_path
     end
   end
 
@@ -217,15 +217,15 @@ module Stdenv
       # Extra setup to support Xcode 4.3+ without CLT.
       self['SDKROOT'] = sdk
       # Tell clang/gcc where system include's are:
-      append 'CPATH', "#{sdk}/usr/include", File::PATH_SEPARATOR
+      append_path 'CPATH', "#{sdk}/usr/include"
       # The -isysroot is needed, too, because of the Frameworks
       append_to_cflags "-isysroot #{sdk}"
       append 'CPPFLAGS', "-isysroot #{sdk}"
       # And the linker needs to find sdk/usr/lib
       append 'LDFLAGS', "-isysroot #{sdk}"
       # Needed to build cmake itself and perhaps some cmake projects:
-      append 'CMAKE_PREFIX_PATH', "#{sdk}/usr", File::PATH_SEPARATOR
-      append 'CMAKE_FRAMEWORK_PATH', "#{sdk}/System/Library/Frameworks", File::PATH_SEPARATOR
+      append_path 'CMAKE_PREFIX_PATH', "#{sdk}/usr"
+      append_path 'CMAKE_FRAMEWORK_PATH', "#{sdk}/System/Library/Frameworks"
     end
   end
 
@@ -250,24 +250,24 @@ module Stdenv
 
   def x11
     # There are some config scripts here that should go in the PATH
-    append 'PATH', MacOS::X11.bin, File::PATH_SEPARATOR
+    append_path 'PATH', MacOS::X11.bin
 
     # Append these to PKG_CONFIG_LIBDIR so they are searched
     # *after* our own pkgconfig directories, as we dupe some of the
     # libs in XQuartz.
-    append 'PKG_CONFIG_LIBDIR', MacOS::X11.lib/'pkgconfig', File::PATH_SEPARATOR
-    append 'PKG_CONFIG_LIBDIR', MacOS::X11.share/'pkgconfig', File::PATH_SEPARATOR
+    append_path 'PKG_CONFIG_LIBDIR', MacOS::X11.lib/'pkgconfig'
+    append_path 'PKG_CONFIG_LIBDIR', MacOS::X11.share/'pkgconfig'
 
     append 'LDFLAGS', "-L#{MacOS::X11.lib}"
-    append 'CMAKE_PREFIX_PATH', MacOS::X11.prefix, File::PATH_SEPARATOR
-    append 'CMAKE_INCLUDE_PATH', MacOS::X11.include, File::PATH_SEPARATOR
+    append_path 'CMAKE_PREFIX_PATH', MacOS::X11.prefix
+    append_path 'CMAKE_INCLUDE_PATH', MacOS::X11.include
 
     append 'CPPFLAGS', "-I#{MacOS::X11.include}"
 
-    append 'ACLOCAL_PATH', MacOS::X11.share/'aclocal', File::PATH_SEPARATOR
+    append_path 'ACLOCAL_PATH', MacOS::X11.share/'aclocal'
 
     unless MacOS::CLT.installed?
-      append 'CMAKE_PREFIX_PATH', MacOS.sdk_path/'usr/X11', File::PATH_SEPARATOR
+      append_path 'CMAKE_PREFIX_PATH', MacOS.sdk_path/'usr/X11'
       append 'CPPFLAGS', "-I#{MacOS::X11.include}/freetype2"
       append 'CFLAGS', "-I#{MacOS::X11.include}"
     end
diff --git a/Library/Homebrew/extend/ENV/super.rb b/Library/Homebrew/extend/ENV/super.rb
index 84247b2fdb..1ca49200b7 100644
--- a/Library/Homebrew/extend/ENV/super.rb
+++ b/Library/Homebrew/extend/ENV/super.rb
@@ -96,7 +96,7 @@ module Superenv
     # so xcrun may not be able to find it
     if self['HOMEBREW_CC'] == 'gcc-4.2'
       apple_gcc42 = Formula.factory('apple-gcc42') rescue nil
-      append('PATH', apple_gcc42.opt_prefix/'bin', File::PATH_SEPARATOR) if apple_gcc42
+      append_path('PATH', apple_gcc42.opt_prefix/'bin') if apple_gcc42
     end
   end
 
diff --git a/Library/Homebrew/requirement.rb b/Library/Homebrew/requirement.rb
index c756c6f938..58b8e57e47 100644
--- a/Library/Homebrew/requirement.rb
+++ b/Library/Homebrew/requirement.rb
@@ -87,8 +87,8 @@ class Requirement
     case o
     when Pathname
       self.class.env do
-        unless ENV["PATH"].split(":").include?(o.parent.to_s)
-          ENV.append("PATH", o.parent, ":")
+        unless ENV["PATH"].split(File::PATH_SEPARATOR).include?(o.parent.to_s)
+          ENV.append_path("PATH", o.parent)
         end
       end
     end
diff --git a/Library/Homebrew/requirements/python_dependency.rb b/Library/Homebrew/requirements/python_dependency.rb
index 6c613a595a..a1429ce096 100644
--- a/Library/Homebrew/requirements/python_dependency.rb
+++ b/Library/Homebrew/requirements/python_dependency.rb
@@ -254,8 +254,8 @@ class PythonInstalled < Requirement
 
     ENV['PYTHONHOME'] = nil  # to avoid fuck-ups.
     ENV['PYTHONPATH'] = if brewed? then nil; else global_site_packages.to_s; end
-    ENV.append 'CMAKE_INCLUDE_PATH', incdir, File::PATH_SEPARATOR
-    ENV.append 'PKG_CONFIG_PATH', pkg_config_path, File::PATH_SEPARATOR if pkg_config_path
+    ENV.append_path 'CMAKE_INCLUDE_PATH', incdir
+    ENV.append_path 'PKG_CONFIG_PATH', pkg_config_path if pkg_config_path
     # We don't set the -F#{framework} here, because if Python 2.x and 3.x are
     # used, `Python.framework` is ambiguous. However, in the `python do` block
     # we can set LDFLAGS+="-F#{framework}" because only one is temporarily set.
diff --git a/Library/Homebrew/test/test_requirement.rb b/Library/Homebrew/test/test_requirement.rb
index cba27d7881..8a2f5f472f 100644
--- a/Library/Homebrew/test/test_requirement.rb
+++ b/Library/Homebrew/test/test_requirement.rb
@@ -75,7 +75,7 @@ class RequirementTests < Test::Unit::TestCase
     end.new
 
     ENV.expects(:with_build_environment).yields.returns(which_path)
-    ENV.expects(:append).with("PATH", which_path.parent, ":")
+    ENV.expects(:append_path).with("PATH", which_path.parent)
 
     req.satisfied?
     req.modify_build_environment