anchor.diff:  
   stdenv.mkDerivation rec {
     pname = "upower";
  -  version = "0.99.17";
  +  version = "0.99.19";
   
     outputs = [ "out" "dev" ]
       ++ lib.optionals withDocs [ "devdoc" ];
  
positive.code:     owner = "upower";
      repo = "upower";
      rev = "v${version}";
      sha256 = "xvvqzGxgkuGcvnO12jnLURNJUoSlnMw2g/mnII+i6Bs=";
    };
  
    strictDeps = true;
  
negative.code:     "-Dos_backend=linux"
      "-Dsystemdsystemunitdir=${placeholder "out"}/etc/systemd/system"
      "-Dudevrulesdir=${placeholder "out"}/lib/udev/rules.d"
      "-Dudevhwdbdir=${placeholder "out"}/lib/udev/hwdb.d"
      "-Dintrospection=${if (stdenv.buildPlatform == stdenv.hostPlatform) then "auto" else "disabled"}"
      "-Dgtk-doc=${lib.boolToString withDocs}"
    ];
  