anchor.diff:      "mirror://cpan/src/5.0/perl-${version}.tar.xz"
     ];
   
  -  version = "5.28.1";
  +  version = "5.30.0";
   in
   stdenv.mkDerivation rec {
     name = "perl-${version}";
  
positive.code:   src = fetchurl {
      urls = tarballUrls version;
      hashOutput = false;
      sha256 = "fea7162d4cca940a387f0587b93f6737d884bf74d8a9d7cfd978bc12cd0b202d";
    };
  
    patches = [
      # Do not look in /usr etc. for dependencies.
      (fetchTritonPatch {
        rev = "9493778a087a474b64c5a8d1c954d11cc3b74d56";
        file = "p/perl/no-sys-dirs.patch";
        sha256 = "1cf5868893c61b3b9e0dbddce8e76ccaa7c530299ce1d5240c06091b8a219b46";
      })
    ];
  
  
negative.code:     libPrefix = "lib/perl5/site_perl";
      srcVerification = fetchurl rec {
        failEarly = true;
        urls = tarballUrls "5.30.0";
        outputHash = "ac501cad4af904d33370a9ea39dbb7a8ad4cb19bc7bc8a9c17d8dc3e81ef6306";
        inherit (src) outputHashAlgo;
        fullOpts = {
          sha256Urls = map (n: "${n}.sha256.txt") urls;
  