diff -ur rubygems-0.9.0/post-install.rb rubygems-0.9.0.new/post-install.rb
--- rubygems-0.9.0/post-install.rb	2006-06-07 10:39:53.000000000 +0700
+++ rubygems-0.9.0.new/post-install.rb	2007-01-28 16:53:13.000000000 +0700
@@ -65,7 +65,7 @@
 end
 
 def install_sources
-  $: << "lib"
+  $:.unshift "lib"
   require 'rubygems'
   Gem::manage_gems
   Dir.chdir("pkgs/sources") do