1 files changed, 6 insertions, 5 deletions
diff --git a/Library/Homebrew/extend/ENV/shared.rb b/Library/Homebrew/extend/ENV/shared.rb
index 2cdc2f83a..6fa9b7778 100644
--- a/Library/Homebrew/extend/ENV/shared.rb
+++ b/Library/Homebrew/extend/ENV/shared.rb
@@ -1,6 +1,7 @@
 require "formula"
 require "compilers"
 require "development_tools"
+require "PATH"
 
 # Homebrew extends Ruby's `ENV` to make our code more readable.
 # Implemented in {SharedEnvExtension} and either {Superenv} or
@@ -80,7 +81,7 @@ module SharedEnvExtension
   end
 
   def append_path(key, path)
-    append key, path, File::PATH_SEPARATOR if File.directory? path
+    self[key] = PATH.new(self[key]).append(path)
   end
 
   # Prepends a directory to `PATH`.
@@ -92,7 +93,7 @@ module SharedEnvExtension
   # (e.g. <pre>ENV.prepend_path "PATH", which("emacs").dirname</pre>)
   def prepend_path(key, path)
     return if %w[/usr/bin /bin /usr/sbin /sbin].include? path.to_s
-    prepend key, path, File::PATH_SEPARATOR if File.directory? path
+    self[key] = PATH.new(self[key]).prepend(path)
   end
 
   def prepend_create_path(key, path)
@@ -196,7 +197,7 @@ module SharedEnvExtension
 
   # @private
   def userpaths!
-    paths = self["PATH"].split(File::PATH_SEPARATOR)
+    paths = PATH.new(self["PATH"]).to_a
     # put Superenv.bin and opt path at the first
     new_paths = paths.select { |p| p.start_with?("#{HOMEBREW_REPOSITORY}/Library/ENV", "#{HOMEBREW_PREFIX}/opt") }
     # XXX hot fix to prefer brewed stuff (e.g. python) over /usr/bin.
@@ -211,7 +212,7 @@ module SharedEnvExtension
         nil
       end
     end - %w[/usr/X11/bin /opt/X11/bin]
-    self["PATH"] = new_paths.uniq.join(File::PATH_SEPARATOR)
+    self["PATH"] = PATH.new(new_paths.uniq)
   end
 
   def fortran
@@ -244,7 +245,7 @@ module SharedEnvExtension
     else
       if (gfortran = which("gfortran", (HOMEBREW_PREFIX/"bin").to_s))
         ohai "Using Homebrew-provided fortran compiler."
-      elsif (gfortran = which("gfortran", ORIGINAL_PATHS.join(File::PATH_SEPARATOR)))
+      elsif (gfortran = which("gfortran", PATH.new(ORIGINAL_PATHS)))
         ohai "Using a fortran compiler found at #{gfortran}."
       end
       if gfortran