anchor.diff:  
         package = mkOption {
           default = pkgs.apacheHttpd.override { mpm = mainCfg.multiProcessingModule; };
  -	example = "pkgs.apacheHttpd_2_4";
  +        example = "pkgs.apacheHttpd_2_4";
           description = "
             Overridable attribute of the Apache HTTP Server package to use.
           ";
  
positive.code: 
        configFile = mkOption {
          default = confFile;
  	example = ''pkgs.writeText "httpd.conf" "# my custom config file ...";'';
          description = "
            Overridable config file to use for Apache. By default, use the
            file automatically generated by nixos.
  
negative.code: 
    mainSubservices = subservicesFor mainCfg;
  
    allSubservices = mainSubservices ++ concatMap subservicesFor mainCfg.virtualHosts;
  
  
    # !!! should be in lib
  