anchor.diff:        owner = "coreos";
         repo = "rkt";
         rev = "v${version}";
  -      sha256 = "1jbdnbd2h58zd5irllim6cfa9bf0fdk5nr8qxpjnsgd1fsyhkpld";
  +      sha256 = "0vvkwdpl9y0g5m00m1h7q8f95hj5qxigpxrb5zwfqrcv3clzn5a6";
     };
   
     stage1BaseImage = fetchurl {
  
positive.code: 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";
    coreosImageSystemdVersion = "231";
  
    # TODO: track https://github.com/coreos/rkt/issues/1758 to allow "host" flavor.
  
negative.code:   stage1Dir = "lib/rkt/stage1-images";
  
  in stdenv.mkDerivation rec {
    version = "1.18.0";
    name = "rkt-${version}";
    BUILDDIR="build-${name}";
  
  