anchor.diff:  
       nativeBuildInputs = [ gn which python2Packages.python perl pkgconfig ];
   
  +    nativeBuildInputs = [
  +      ninja which perl pkgconfig python
  +      python2Packages.ply python2Packages.jinja2
  +    ];
  +
       buildInputs = defaultDependencies ++ [
         nspr nss systemd
         utillinux alsaLib
  
positive.code:       glib gtk2 dbus_glib
        libXScrnSaver libXcursor libXtst mesa
        pciutils protobuf speechd libXdamage
        python2Packages.ply python2Packages.jinja2
      ] ++ optional gnomeKeyringSupport libgnome_keyring3
        ++ optionals gnomeSupport [ gnome.GConf libgcrypt ]
        ++ optional enableSELinux libselinux
  
negative.code: 
      buildPhase = let
        buildCommand = target: ''
          ninja -C "${buildPath}"  \
            -j$NIX_BUILD_CORES -l$NIX_BUILD_CORES \
            "${target}"
        '' + optionalString (target == "mksnapshot" || target == "chrome") ''
  