anchor.diff:    passthru = {
       srcVerification = fetchurl rec {
         failEarly = true;
  -      urls = tarballUrls "1.16";
  +      urls = tarballUrls "1.16.1";
         pgpsigUrls = map (n: "${n}.sig") urls;
         pgpKeyFingerprints = [
           # Mathieu Lirzin
           "F2A3 8D7E EB2B 6640 5761  070D 0ADE E100 9460 4D37"
         ];
  -      outputHash = "f98f2d97b11851cbe7c2d4b4eaef498ae9d17a3c2ef1401609b7b4ca66655b8a";
  +      outputHash = "5d05bb38a23fd3312b10aea93840feec685bdf4a41146e78882848165d3ae921";
         inherit (src) outputHashAlgo;
       };
     };
  
positive.code: }:
  
  let
    version = "1.16";
  
    tarballUrls = version: [
      "mirror://gnu/automake/automake-${version}.tar.xz"
  
negative.code:   src = fetchurl {
      url = tarballUrls version;
      hashOutput = false;
      sha256 = "5d05bb38a23fd3312b10aea93840feec685bdf4a41146e78882848165d3ae921";
    };
  
    nativeBuildInputs = [
  