anchor.diff:  , perl
   , xmlto
   
  -, coreutils
  +, coreutils_small
   , cpio
   , curl
   , expat
  -, gawk
  +, gawk_small
   , gnugrep
  -, gnused
  +, gnused_small
   , openssl
  -, pcre2
  +, pcre2_lib
   , python
   , zlib
   }:
  
positive.code:   src = fetchurl {
      urls = map (n: "${n}.xz") tarballUrls;
      hashOutput = false;
      sha256 = "345056aa9b8084280b1b9fe1374d232dec05a34e8849028a20bfdb56e920dbb5";
    };
  
    nativeBuildInputs = [
  
negative.code:     "--with-libpcre"
      "--without-tcltk"
    ];
  
    makeFlags = [
      "PERL_PATH=${perl}/bin/perl"
  