anchor.diff:    services.xserver.defaultDepth = mkOverride 50 {} 0;
     services.xserver.resolutions = mkOverride 50 {} [];
   
  +  services.mingetty.ttys = ttys ++ optional (!cfg.graphics) "ttyS0";
  +
     # Wireless won't work in the VM.
     networking.enableWLAN = mkOverride 50 {} false;
   }
  
positive.code:             exist.
            '';
        };
  
    };
  
  
    # Shell script to start the VM.
    startVM =
  
negative.code:           -drive file=$NIX_DISK_IMAGE,if=virtio,boot=on \
            -kernel ${config.system.build.toplevel}/kernel \
            -initrd ${config.system.build.toplevel}/initrd \
            ${qemuGraphics} \
            $QEMU_OPTS \
            -append "$(cat ${config.system.build.toplevel}/kernel-params) init=${config.system.build.bootStage2} systemConfig=${config.system.build.toplevel} ${kernelConsole} $QEMU_KERNEL_PARAMS"
      '';
  
  in
  