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diff --git a/jni/ruby/nacl/package.rb b/jni/ruby/nacl/package.rb
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+#!/usr/bin/ruby
+# Copyright:: Copyright 2012 Google Inc.
+# License:: All Rights Reserved.
+# Original Author:: Yugui Sonoda (mailto:yugui@google.com)
+#
+# Generates a runnable package of the pepper API example.
+
+require File.join(File.dirname(__FILE__), 'nacl-config')
+require 'json'
+require 'find'
+require 'fileutils'
+
+include NaClConfig
+
+class Installation
+  include NaClConfig
+
+  SRC_DIRS = [
+    Dir.pwd,
+    HOST_LIB,
+    NACL_LIB,
+  ]
+
+  def initialize(destdir)
+    @destdir = destdir
+    @manifest = {
+      "files" => {}
+    }
+    ruby_libs.each do |path|
+      raise "Collision of #{path}" if @manifest['files'].key? path
+      @manifest['files'][path] = {
+        ARCH => {
+          "url" => path
+        }
+      }
+      if path[/\.so$/]
+        alternate_path = path.gsub('/', "_")
+        raise "Collision of #{alternate_path}" if @manifest['files'].key? alternate_path
+        @manifest['files'][alternate_path] = {
+          ARCH => {
+            "url" => path
+          }
+        }
+      end
+    end
+  end
+
+  def manifest
+    @manifest.dup
+  end
+
+  def install_program(basename)
+    do_install_binary(basename, File.join(@destdir, "bin", ARCH))
+    @manifest["program"] = {
+      ARCH => {
+        "url" => File.join("bin", ARCH, basename)
+      }
+    }
+  end
+
+  def install_library(name, basename)
+    do_install_binary(basename, File.join(@destdir, "lib", ARCH))
+    @manifest["files"][name] = {
+      ARCH => {
+        "url" => File.join("lib", ARCH, basename)
+      }
+    }
+  end
+
+  private
+  def do_install_binary(basename, dest_dir)
+    full_path = nil
+    catch(:found) {
+      SRC_DIRS.each do |path|
+        full_path = File.join(path, basename)
+        if File.exist? full_path
+          throw :found
+        end
+      end
+      raise Errno::ENOENT, "No such file to install: %s" % basename
+    }
+    FileUtils.mkdir_p dest_dir
+    system("#{INSTALL_PROGRAM} #{full_path} #{dest_dir}")
+  end
+
+  def ruby_libs
+    Find.find(RbConfig::CONFIG['rubylibdir']).select{|path| File.file?(path) }.map{|path| path.sub("#{@destdir}/", "") }
+  end
+end
+
+def install(destdir)
+  inst = Installation.new(destdir)
+  manifest = JSON.parse(File.read("pepper-ruby.nmf"))
+
+  program = File.basename(manifest['program'][ARCH]['url'])
+  inst.install_program(program)
+
+  manifest['files'].each do |name, attr|
+    inst.install_library(name, File.basename(attr[ARCH]["url"]))
+  end
+
+  File.open(File.join(destdir, "ruby.nmf"), "w") {|f|
+    f.puts JSON.pretty_generate(inst.manifest)
+  }
+end
+
+def main
+  install(ARGV[0])
+end
+
+if __FILE__ == $0
+  main()
+end