add_load_paths

# File railties/lib/rails/gem_dependency.rb, line 26
    def add_load_paths
      return if @loaded || @load_paths_added
      unpacked_paths = Dir[File.join(self.class.unpacked_path, "#{@name}-#{@version || "*"}")]
      if unpacked_paths.empty?
        args = [@name]
        args << @requirement.to_s if @requirement
        gem *args
      else
        $LOAD_PATH.unshift File.join(unpacked_paths.first, 'lib')
        ext = File.join(unpacked_paths.first, 'ext')
        $LOAD_PATH.unshift(ext) if File.exist?(ext)
        @frozen = true
      end
      @load_paths_added = true
    rescue Gem::LoadError
    end