anchor.diff:      homepage = "http://www.qemu.org/";
       description = "A generic and open source machine emulator and virtualizer";
       license = licenses.gpl2Plus;
  -    maintainers = with maintainers; [ eelco ];
  -    platforms = platforms.linux ++ platforms.darwin;
  +    maintainers = with maintainers; [ eelco qyliss ];
  +    platforms = platforms.unix;
     };
   }
  
positive.code: 
    src = fetchurl {
      url= "https://download.qemu.org/qemu-${version}.tar.xz";
      sha256 = "1g0pvx4qbirpcn9mni704y03n3lvkmw2c0rbcwvydyr8ns4xh66b";
    };
  
    nativeBuildInputs = [ python python.pkgs.sphinx pkg-config flex bison meson ninja ]
  
negative.code: in
  
  stdenv.mkDerivation rec {
    version = "6.0.0";
    pname = "qemu"
      + lib.optionalString xenSupport "-xen"
      + lib.optionalString hostCpuOnly "-host-cpu-only"
  