anchor.diff: -{ lib, file, fetchFromGitLab, buildPerlPackage, ArchiveZip, ArchiveCpio }:
  +{ stdenv, file, fetchFromGitLab, buildPerlPackage, ArchiveZip, ArchiveCpio, shortenPerlShebang }:
   
   buildPerlPackage rec {
     pname = "strip-nondeterminism";
  
positive.code:     rm $out/share/man/man1/dh_strip_nondeterminism.1.gz
    '';
  
    meta = with lib; {
      description = "A Perl module for stripping bits of non-deterministic information";
      homepage = "https://reproducible-builds.org/";
      license = licenses.gpl3;
  
negative.code:   # stray test failure
    doCheck = false;
  
    nativeBuildInputs = stdenv.lib.optionals stdenv.isDarwin [ shortenPerlShebang ];
    buildInputs = [ ArchiveZip ArchiveCpio file ];
  
    perlPostHook = ''
  