anchor.diff:    passthru = {
       srcVerification = fetchurl rec {
         failEarly = true;
  -      urls = tarballUrls "1.7.7";
  +      urls = tarballUrls "1.7.8";
         pgpsigUrls = map (n: "${n}.sig") urls;
         pgpKeyFingerprints = [
           # Werner Koch
  
positive.code:   src = fetchurl {
      urls = tarballUrls version;
      hashOutput = false;
      sha256 = "b9b85eba0793ea3e6e66b896eb031fa05e1a4517277cc9ab10816b359254cd9a";
    };
  
    buildInputs = [
  
negative.code:         # NIIBE Yutaka
          "031E C253 6E58 0D8E A286  A9F2 2071 B08A 33BD 3F06"
        ];
        outputHash = "948276ea47e6ba0244f36a17b51dcdd52cfd1e664b0a1ac3bc82134fb6cec199";
        inherit (src) outputHashAlgo;
      };
    };
  