anchor.diff:        description = "Nginx Web Server";
         after = [ "network.target" ];
         wantedBy = [ "multi-user.target" ];
  -      path = [ pkgs.nginx ];
  +      path = [ nginx ];
         preStart =
           ''
           mkdir -p ${cfg.stateDir}/logs
  -        chown -R nginx:nginx ${cfg.stateDir}
  +        chown -R ${cfg.user}:${cfg.group} ${cfg.stateDir}
           '';
         serviceConfig = {
  -        ExecStart = "${pkgs.nginx}/bin/nginx -c ${configFile} -p ${cfg.stateDir}";
  +        ExecStart = "${nginx}/bin/nginx -c ${configFile} -p ${cfg.stateDir}";
         };
       };
   
  
positive.code: 
  let
    cfg = config.services.nginx;
    configFile = pkgs.writeText "nginx.conf" ''
      user nginx nginx;
      daemon off;
      ${cfg.config}
    '';
  
negative.code:           Directory holding all state for nginx to run.
          ";
        };
  
        user = mkOption {
          default = "nginx";
          description = "User account under which nginx runs.";
        };
  
        group = mkOption {
          default = "nginx";
          description = "Group account under which nginx runs.";
        };
  
        fullWebDAV = mkOption {
          default = false;
          description = "Compile in a third party module providing full WebDAV support";
        };
      };
  
    };
  
    config = mkIf cfg.enable {
      environment.systemPackages = [ nginx ];
  
      # TODO: test user supplied config file pases syntax test
  
  