anchor.diff:      rev    = "v${version}";
       owner  = "ostreedev";
       repo   = "ostree";
  -    sha256 = "0gxvpzwz7z4zihz5hkn6ajv7f6gas4zi2pznhi5v6wy7cw06if68";
  +    sha256 = "00jgj6vcjpz1akfbmf82q1bcs3njrmvdgy4c2gnn24vkmh9yr0lr";
     };
   
     nativeBuildInputs = [
  
positive.code:     sha256 = "1h71d2h2d3anp4msvpaff445rnzdxii3id2yglqk7af9i43kdsn1";
    };
  
    version = "2017.12";
  in stdenv.mkDerivation {
    name = "ostree-${version}";
  
  
negative.code:   libglnx-src = fetchFromGitHub {
      owner  = "GNOME";
      repo   = "libglnx";
      rev    = "0c82203cd459a35cc3f471e3205355e9fb79160f";
      sha256 = "0xbrv7q6b2ygrbr0yr7p01zpryw45643qfwnlw0z2yv515qs7isc";
    };
  
    bsdiff-src = fetchFromGitHub {
  