Move method back to Pathname.

Library/Homebrew/extend/pathname.rb

@@ -208,6 +208,21 @@ class Pathname
     prefix = prefix.to_s
     self.to_s[0, prefix.length] == prefix
   end
+
+  def make_relative_symlink src
+    self.dirname.mkpath
+    Dir.chdir self.dirname do
+      # TODO use Ruby function so we get exceptions
+      # NOTE Ruby functions may work, but I had a lot of problems
+      rv=system 'ln', '-sf', src.relative_path_from(self.dirname)
+      unless rv and $? == 0
+        raise <<-EOS
+Could not create symlink #{to_s}.
+Check that you have permssions on #{self.dirname}
+        EOS
+      end
+    end
+  end
 end
 
 # sets $n and $d so you can observe creation of stuff
@@ -228,16 +243,10 @@ module ObserverPathnameExtension
     $d+=1
   end
   def make_relative_symlink src
-    dirname.mkpath
-    Dir.chdir dirname do
-      # TODO use Ruby function so we get exceptions
-      # NOTE Ruby functions may work, but I had a lot of problems
-      rv=system 'ln', '-sf', src.relative_path_from(dirname)
-      raise "Could not create symlink #{to_s}" unless rv and $? == 0
+    super
     puts "ln #{to_s}" if ARGV.verbose?
     $n+=1
   end
-  end
 end
 
 $n=0