anchor.diff:      srcVerification = fetchurl rec {
         inherit (src) outputHashAlgo;
         failEarly = true;
  -      urls = tarballUrls "5.0.0";
  -      outputHash = "50f091ed0eb485ad87dbb620d773a3e2c31a27f75f5e008f7bf065055f024406";
  +      urls = tarballUrls "5.0.1";
  +      outputHash = "8e4e86f04ed789648b66f757329743a0d6dfb5294c3b91b756a474f1ce05a794";
         fullOpts = {
           pgpsigUrls = map (n: "${n}.sig") urls;
           pgpKeyFingerprint = "D196 7C63 7887 1317 7D86  1ED7 DF59 7815 937E C0D2";
  
positive.code:   src = fetchurl {
      urls = tarballUrls version;
      hashOutput = false;
      sha256 = "50f091ed0eb485ad87dbb620d773a3e2c31a27f75f5e008f7bf065055f024406";
    };
  
    # Small build doesn't need floating point with gmp / mpfr
  
negative.code:     optionals
      optionalString;
  
    version = "5.0.1";
  
    tarballUrls = version: [
      "mirror://gnu/gawk/gawk-${version}.tar.xz"
  