```ruby
# -*- encoding: utf-8 -*-

$:.unshift(File.dirname(__FILE__) + '/lib')
require 'mixlib/config/version'


Gem::Specification.new do |s|
  s.name = "mixlib-config"
  s.version = Mixlib::Config::VERSION

  s.authors = ["Chef Software, Inc."]
  s.email = "legal@chef.io"
  s.extra_rdoc_files = [
    "LICENSE",
    "README.md"
  ]
  s.files = [ "LICENSE", "NOTICE", "README.md", "Gemfile", "Rakefile" ] + Dir.glob("{lib,spec}/**/*")
  s.homepage = "http://www.chef.io"
  s.require_paths = ["lib"]
  s.rubygems_version = "1.8.23"
  s.summary = "A class based configuration library"
  s.description = s.summary
  s.license = "Apache-2.0"

  s.add_development_dependency 'rake'
  s.add_development_dependency 'rspec', '~> 2.99'
  s.add_development_dependency 'rdoc'
end
```

Add gemspec files to allow bundler to run from the gem
user
```ruby
# -*- encoding: utf-8 -*-

$:.unshift(File.dirname(__FILE__) + '/lib')
require 'mixlib/config/version'


Gem::Specification.new do |s|
  s.name = "mixlib-config"
  s.version = Mixlib::Config::VERSION

  s.authors = ["Chef Software, Inc."]
  s.email = "legal@chef.io"
  s.extra_rdoc_files = [
    "LICENSE",
    "README.md"
  ]
  s.files = [ "LICENSE", "NOTICE", "README.md", "Gemfile", "Rakefile" ] + Dir.glob("*.gemspec") +
      Dir.glob("{lib,spec}/**/*", File::FNM_DOTMATCH).reject {|f| File.directory?(f) }
  s.homepage = "http://www.chef.io"
  s.require_paths = ["lib"]
  s.rubygems_version = "1.8.23"
  s.summary = "A class based configuration library"
  s.description = s.summary
  s.license = "Apache-2.0"

  s.add_development_dependency 'rake'
  s.add_development_dependency 'rspec', '~> 2.99'
  s.add_development_dependency 'rdoc'
end
```
assistant