anchor.diff:    src = fetchurl {
       urls = tarballUrls version;
       hashOutput = false;
  -    sha256 = "cbd6ebc5aaf080ed60d0162d7f6aeae58211a1ee9ba9bb25623daa6cd942683b";
  +    sha256 = "7aad73c8839c2bdadca9476f884d2953cdace9567ecd0d90f9959f229d146b40";
     };
   
     nativeBuildInputs = [
       perl
  +  ];
  +
  +  buildInputs = [
  +    acl
     ];
   
     postPatch = ''
  
positive.code: { stdenv
  , fetchurl
  , perl
  }:
  
  let
    version = "4.4";
  
    tarballUrls = version: [
      "mirror://gnu/sed/sed-${version}.tar.xz"
  
negative.code:   passthru = {
      srcVerification = fetchurl rec {
        failEarly = true;
        urls = tarballUrls "4.5";
        pgpsigUrls = map (n: "${n}.sig") urls;
        pgpKeyFingerprint = "155D 3FC5 00C8 3448 6D1E  EA67 7FD9 FCCB 000B EEEE";
        inherit (src) outputHashAlgo;
        outputHash = "7aad73c8839c2bdadca9476f884d2953cdace9567ecd0d90f9959f229d146b40";
      };
    };
  
  