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diff --git a/lib/rubygems/package_task.rb b/lib/rubygems/package_task.rb
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+# Copyright (c) 2003, 2004 Jim Weirich, 2009 Eric Hodel
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+require 'rubygems'
+begin
+  gem 'rake'
+rescue Gem::LoadError
+end
+
+require 'rake/packagetask'
+
+##
+# Create a package based upon a Gem::Specification.  Gem packages, as well as
+# zip files and tar/gzipped packages can be produced by this task.
+#
+# In addition to the Rake targets generated by Rake::PackageTask, a
+# Gem::PackageTask will also generate the following tasks:
+#
+# [<b>"<em>package_dir</em>/<em>name</em>-<em>version</em>.gem"</b>]
+#   Create a RubyGems package with the given name and version.
+#
+# Example using a Gem::Specification:
+#
+#   require 'rubygems'
+#   require 'rubygems/package_task'
+#   
+#   spec = Gem::Specification.new do |s|
+#     s.platform = Gem::Platform::RUBY
+#     s.summary = "Ruby based make-like utility."
+#     s.name = 'rake'
+#     s.version = PKG_VERSION
+#     s.requirements << 'none'
+#     s.require_path = 'lib'
+#     s.autorequire = 'rake'
+#     s.files = PKG_FILES
+#     s.description = <<-EOF
+#   Rake is a Make-like program implemented in Ruby. Tasks
+#   and dependencies are specified in standard Ruby syntax.
+#     EOF
+#   end
+#   
+#   Gem::PackageTask.new(spec) do |pkg|
+#     pkg.need_zip = true
+#     pkg.need_tar = true
+#   end
+
+class Gem::PackageTask < Rake::PackageTask
+
+  ##
+  # Ruby Gem::Specification containing the metadata for this package.  The
+  # name, version and package_files are automatically determined from the
+  # gemspec and don't need to be explicitly provided.
+
+  attr_accessor :gem_spec
+
+  ##
+  # Create a Gem Package task library.  Automatically define the gem if a
+  # block is given.  If no block is supplied, then #define needs to be called
+  # to define the task.
+
+  def initialize(gem_spec)
+    init gem_spec
+    yield self if block_given?
+    define if block_given?
+  end
+
+  ##
+  # Initialization tasks without the "yield self" or define operations.
+
+  def init(gem)
+    super gem.name, gem.version
+    @gem_spec = gem
+    @package_files += gem_spec.files if gem_spec.files
+  end
+
+  ##
+  # Create the Rake tasks and actions specified by this Gem::PackageTask.
+  # (+define+ is automatically called if a block is given to +new+).
+
+  def define
+    super
+    task :package => [:gem]
+    desc "Build the gem file #{gem_file}"
+    task :gem => ["#{package_dir}/#{gem_file}"]
+    file "#{package_dir}/#{gem_file}" => [package_dir] + @gem_spec.files do
+      when_writing("Creating #{gem_spec.full_name}.gem") {
+        Gem::Builder.new(gem_spec).build
+        verbose(true) {
+          mv gem_file, "#{package_dir}/#{gem_file}"
+        }
+      }
+    end
+  end
+
+  def gem_file
+    "#{@gem_spec.full_name}.gem"
+  end
+
+end
+