anchor.diff:    src = fetchurl {
       urls = tarballUrls version;
       hashOutput = false;
  -    sha256 = "528f6a81ad34cbc76aa7dce5a82f8b3d2078ef065271ab81fda033842018a8dc";
  +    sha256 = "f371cbfd63f879065422b58fa6b81e21870cd791ef6e11d4528608204aa4dcfb";
     };
   
     nativeBuildInputs = [
  
positive.code:   passthru = {
      srcVerification = fetchurl rec {
        failEarly = true;
        urls = tarballUrls "1.47.8";
        pgpsigUrls = map (n: "${n}.sig") urls;
        pgpKeyFingerprint = "87EA 44D1 50D8 9615 E39A  3FEE F0DC 8E00 B28C 5995";
        inherit (src) outputHashAlgo;
        outputHash = "528f6a81ad34cbc76aa7dce5a82f8b3d2078ef065271ab81fda033842018a8dc";
      };
    };
  
  
negative.code: }:
  
  let
    version = "1.47.10";
  
    tarballUrls = version: [
      "mirror://gnu/help2man/help2man-${version}.tar.xz"
  