anchor.diff:        ln -sv $(cd $out/bin && echo qemu-system-*) $out/bin/qemu-kvm
       '';
   
  +  enableParallelBuilding = true;
  +
     meta = {
       homepage = http://www.linux-kvm.org/;
       description = "A full virtualization solution for Linux on x86 hardware containing virtualization extensions";
  
positive.code:   configureFlags =
      [ "--audio-drv-list=alsa"
        "--smbd=smbd"                               # use `smbd' from $PATH
      ] ++ stdenv.lib.optional spiceSupport "--enable-spice";
  
    enableParallelBuilding = true;
  
    buildInputs =
      [ attr zlib SDL alsaLib pkgconfig pciutils libuuid vde2 libjpeg libpng
        ncurses python glib libaio mesa
      ] ++ stdenv.lib.optionals spiceSupport [ spice_protocol spice ];
  
    postInstall =
      ''
  
negative.code:     sha256 = "018vb5nmk2fsm143bs2bl2wirhasd4b10d7jchl32zik4inbk2p9";
    };
  
    buildInputs =
      [ attr zlib SDL alsaLib pkgconfig pciutils libuuid vde2 libjpeg libpng
        ncurses python glib libaio mesa texinfo perl
      ] ++ stdenv.lib.optionals spiceSupport [ spice_protocol spice ];
  
    patchPhase =
      '' for i in $(find . -type f)
         do
           sed -i "$i" \
  