anchor.diff:    passthru = {
       srcVerification = fetchurl rec {
         failEarly = true;
  -      urls = tarballUrls "1.47.4";
  +      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 = "d4ecf697d13f14dd1a78c5995f06459bff706fd1ce593d1c02d81667c0207753";
  +      outputHash = "7ca60b2519fdbe97f463fe2df66a6188d18b514bfd44127d985f0234ee2461b1";
       };
     };
   
  
positive.code:   src = fetchurl {
      urls = tarballUrls version;
      hashOutput = false;
      sha256 = "d4ecf697d13f14dd1a78c5995f06459bff706fd1ce593d1c02d81667c0207753";
    };
  
    nativeBuildInputs = [
  
negative.code: }:
  
  let
    version = "1.47.5";
  
    tarballUrls = version: [
      "mirror://gnu/help2man/help2man-${version}.tar.xz"
  