activesupport/lib/active_support/vendor.rb


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[%w(builder 2.1.2), %w(i18n 0.1.3), %w(memcache-client 1.7.5), %w(tzinfo 0.3.13)].each do |lib, version|
  # Try to activate a gem ~> satisfying the requested version first.
  begin
    gem lib, "~> #{version}"
  # Use the vendored lib if the gem's missing or we aren't using RubyGems.
  rescue LoadError, NoMethodError
    # Skip if there's already a vendored lib already provided.
    if $LOAD_PATH.grep(Regexp.new(lib)).empty?
      # Push, not unshift, so the vendored lib is lowest priority.
      $LOAD_PATH << File.expand_path("#{File.dirname(__FILE__)}/vendor/#{lib}-#{version}/lib")
    end
  end
end