anchor.diff:        # this file is expected in /etc/qemu and not sysconfdir (/var/lib)
         etc."qemu/bridge.conf".text = lib.concatMapStringsSep "\n" (e:
           "allow ${e}") cfg.allowedBridges;
  -      systemPackages = with pkgs; [ libvirt libressl.nc iptables cfg.qemuPackage ];
  +      systemPackages = with pkgs; [ libressl.nc iptables cfg.package cfg.qemuPackage ];
         etc.ethertypes.source = "${pkgs.iptables}/etc/ethertypes";
       };
   
  
positive.code: 
      systemd.services.virtlogd = {
        description = "Virtual machine log manager";
        serviceConfig.ExecStart = "@${pkgs.libvirt}/sbin/virtlogd virtlogd";
        restartIfChanged = false;
      };
  
  
negative.code: 
      systemd.services.virtlockd = {
        description = "Virtual machine lock manager";
        serviceConfig.ExecStart = "@${cfg.package}/sbin/virtlockd virtlockd";
        restartIfChanged = false;
      };
  
  