anchor.diff:  { stdenv
   , fetchurl
   , lib
  -
  -, libbsd
   }:
   
   let
  
positive.code:   src = fetchurl {
      urls = tarballUrls version;
      hashOutput = false;
      sha256 = "17b43c2716d521369f82fc2dc70f359860e90fa440bea65b3b85f0b246ea81f2";
    };
  
    configureFlags = [
      "--with-libbsd"
    ];
  
    buildInputs = [
      libbsd
    ];
  
    passthru = {
      srcVerification = fetchurl rec {
        failEarly = true;
        inherit (src)
          outputHashAlgo;
        urls = tarballUrls "2.2.6";
        fullOpts = {
          pgpsigUrls = map (n: "${n}.asc") urls;
          pgpKeyFingerprint = "3D7E 959D 89FA CFEE 3837  1921 B00B C66A 401A 1600";
        };
        outputHash = "17b43c2716d521369f82fc2dc70f359860e90fa440bea65b3b85f0b246ea81f2";
      };
    };
  
  
negative.code:     "mirror://sourceforge/expat/expat/${version}/expat-${version}.tar.bz2"
    ];
  
    version = "2.2.7";
  in
  stdenv.mkDerivation rec {
    name = "expat-${version}";
  