anchor.diff:  , xdg_utils, yasm, minizip, libwebp
   , libusb1, pciutils, nss
   
  -, python, pythonPackages, perl, pkgconfig
  +, python2Packages, perl, pkgconfig
   , nspr, systemd, kerberos
   , utillinux, alsaLib
   , bison, gperf
  
positive.code: with stdenv.lib;
  
  let
    # The additional attributes for creating derivations based on the chromium
    # source tree.
    extraAttrs = buildFun base;
  
negative.code:       glib gtk2 dbus_glib
        libXScrnSaver libXcursor libXtst mesa
        pciutils protobuf speechd libXdamage
        gyp ply jinja2
      ] ++ optional gnomeKeyringSupport libgnome_keyring3
        ++ optionals gnomeSupport [ gnome.GConf libgcrypt ]
        ++ optional enableSELinux libselinux
  