anchor.diff:  let
     # Always get the information from
     # https://github.com/coreos/rkt/blob/v${VERSION}/stage1/usr_from_coreos/coreos-common.mk
  -  coreosImageRelease = "1151.0.0";
  +  coreosImageRelease = "1192.0.0";
     coreosImageSystemdVersion = "231";
   
     # TODO: track https://github.com/coreos/rkt/issues/1758 to allow "host" flavor.
  
positive.code:       owner = "coreos";
        repo = "rkt";
        rev = "v${version}";
        sha256 = "1jbdnbd2h58zd5irllim6cfa9bf0fdk5nr8qxpjnsgd1fsyhkpld";
    };
  
    stage1BaseImage = fetchurl {
  
negative.code:   stage1Dir = "lib/rkt/stage1-images";
  
  in stdenv.mkDerivation rec {
    version = "1.18.0";
    name = "rkt-${version}";
    BUILDDIR="build-${name}";
  
  