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