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diff --git a/ruby_1_9_3/lib/rubygems/builder.rb b/ruby_1_9_3/lib/rubygems/builder.rb
new file mode 100644
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+++ b/ruby_1_9_3/lib/rubygems/builder.rb
@@ -0,0 +1,99 @@
+#--
+# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
+# All rights reserved.
+# See LICENSE.txt for permissions.
+#++
+
+require 'rubygems'
+require 'rubygems/user_interaction'
+
+Gem.load_yaml
+
+require 'rubygems/package'
+
+##
+# The Builder class processes RubyGem specification files
+# to produce a .gem file.
+
+class Gem::Builder
+
+  include Gem::UserInteraction
+
+  ##
+  # Constructs a builder instance for the provided specification
+  #
+  # spec:: [Gem::Specification] The specification instance
+
+  def initialize(spec)
+    @spec = spec
+  end
+
+  ##
+  # Builds the gem from the specification.  Returns the name of the file
+  # written.
+
+  def build(skip_validation=false)
+    @spec.mark_version
+    @spec.validate unless skip_validation
+    @signer = sign
+    write_package
+    say success if Gem.configuration.verbose
+    File.basename @spec.cache_file
+  end
+
+  def success
+    <<-EOM
+  Successfully built RubyGem
+  Name: #{@spec.name}
+  Version: #{@spec.version}
+  File: #{File.basename @spec.cache_file}
+EOM
+  end
+
+  private
+
+  ##
+  # If the signing key was specified, then load the file, and swap to the
+  # public key (TODO: we should probably just omit the signing key in favor of
+  # the signing certificate, but that's for the future, also the signature
+  # algorithm should be configurable)
+
+  def sign
+    signer = nil
+
+    if @spec.respond_to?(:signing_key) and @spec.signing_key then
+      require 'rubygems/security'
+
+      signer = Gem::Security::Signer.new @spec.signing_key, @spec.cert_chain
+      @spec.signing_key = nil
+      @spec.cert_chain = signer.cert_chain.map { |cert| cert.to_s }
+    end
+
+    signer
+  end
+
+  def write_package
+    file_name = File.basename @spec.cache_file
+    open file_name, 'wb' do |gem_io|
+      Gem::Package.open gem_io, 'w', @signer do |pkg|
+        yaml = @spec.to_yaml
+        pkg.metadata = yaml
+
+        @spec.files.each do |file|
+          next if File.directory?(file)
+          next if file == file_name # Don't add gem onto itself
+
+          stat = File.stat(file)
+          mode = stat.mode & 0777
+          size = stat.size
+
+          pkg.add_file_simple file, mode, size do |tar_io|
+            tar_io.write open(file, "rb") { |f| f.read }
+          end
+        end
+      end
+    end
+  end
+
+end
+