anchor.diff:    passthru = {
       srcVerification = fetchurl rec {
         failEarly = true;
  -      urls = tarballUrls "4173" "1.8.17";
  -      pgpsigUrls = map (n: "${n}.asc") (tarballUrls "4174" "1.8.17");
  +      urls = tarballUrls "4179" "1.8.18";
  +      pgpsigUrls = map (n: "${n}.asc") (tarballUrls "4180" "1.8.18");
         pgpKeyFingerprint = "F5E1 1B9F FE91 1146 F41D  953D 78A1 B4DF E8F9 C57E";
         inherit (src) outputHashAlgo;
  -      outputHash = "d72b6f8654024f2a1d2de70f8f1d39776bd872870a4f453f436fd93d4312026f";
  +      outputHash = "b22d32b018f6a1016adba91abfcc63876cca999daa472dd86e953ddd41d00905";
       };
     };
   
  
positive.code: }:
  
  let
    id = "4173";
    version = "1.8.17";
  
    tarballUrls = id: version: [
      "https://alioth.debian.org/frs/download.php/file/${id}/pcsc-lite-${version}.tar.bz2"
  
negative.code:   src = fetchurl {
      urls = tarballUrls id version;
      allowHashOutput = false;
      multihash = "QmUCkePPFomf5KBJAHPNYfNtpNkGF7sDjeJ3CfXNhQtCvv";
      sha256 = "b22d32b018f6a1016adba91abfcc63876cca999daa472dd86e953ddd41d00905";
    };
  
    nativeBuildInputs = optionals (!libOnly) [
  