anchor.diff:    src = fetchurl {
       urls = tarballUrls version;
       hashOutput = false;
  -    sha256 = "7ca60b2519fdbe97f463fe2df66a6188d18b514bfd44127d985f0234ee2461b1";
  +    sha256 = "d91b0295b72a638e4a564f643e4e6d1928779131f628c00f356c13bf336de46f";
     };
   
     nativeBuildInputs = [
  
positive.code:   passthru = {
      srcVerification = fetchurl rec {
        failEarly = true;
        urls = tarballUrls "1.47.5";
        pgpsigUrls = map (n: "${n}.sig") urls;
        pgpKeyFingerprint = "87EA 44D1 50D8 9615 E39A  3FEE F0DC 8E00 B28C 5995";
        inherit (src) outputHashAlgo;
        outputHash = "7ca60b2519fdbe97f463fe2df66a6188d18b514bfd44127d985f0234ee2461b1";
      };
    };
  
  
negative.code: }:
  
  let
    version = "1.47.6";
  
    tarballUrls = version: [
      "mirror://gnu/help2man/help2man-${version}.tar.xz"
  