# File lib/phusion_passenger/platform_info/apache.rb, line 199
        def self.httpd_included_config_files(config_file, options = nil)
                state = {
                        :files => { config_file => true },
                        :unreadable_files => [],
                        :root => httpd_default_root(options)
                }
                scan_for_included_apache2_config_files(config_file, state, options)
                return {
                        :files => state[:files].keys,
                        :unreadable_files => state[:unreadable_files]
                }
        end