anchor.diff:  { stdenv
   , autoreconfHook
   , fetchFromGitHub
  +, lib
   
   , curl
   , expat
  
positive.code:     owner = "sshock";
      repo = "AFFLIBv3";
      rev = "v${version}";
      sha256 = "26f09cafbe3ea4a3cc32ffb2208a0e2b647d04749970b023ccde54d1bd47baa0";
    };
  
    nativeBuildInputs = [
      autoreconfHook
    ];
    
    buildInputs = [
      curl
      expat
  
negative.code:     "--enable-s3"
    ];
  
    meta = with lib; {
      maintainers = with maintainers; [
        wkennington
      ];
  