anchor.diff:  
     lz4 = fetchgit rec {
       url = "https://github.com/lz4/lz4.git";
  -    rev = "v1.8.2";
  -    sha256 = "1niv553q60hwn95yflzmrqkp1046hrid13h0yr36lm4fjza21h9w";
  +    rev = "v1.9.2";
  +    sha256 = "0322xy2vfhxkb8akas7vwajjgcigq1q8l9f5fnfmavcsd6kmxmgg";
       leaveDotGit = true;
       fetchSubmodules = false;
       postFetch = "cd $out && git tag ${rev}";
  
positive.code:   };
  in stdenv.mkDerivation rec {
    pname = "rippled";
    version = "1.5.0";
  
    src = fetchgit {
      url = "https://github.com/ripple/rippled.git";
      rev = version;
      sha256 = "0nh0x1ygrj3fw558vxbcp0md80qh27yrp3xhdlasrir7h1l2nplv";
      leaveDotGit = true;
      fetchSubmodules = true;
    };
  
negative.code: 
    libarchive = fetchgit rec {
      url = "https://github.com/libarchive/libarchive.git";
      rev = "v3.4.3";
      sha256 = "00yrzy2129vr4nfhigd91651984sl447dyfjfz26dmzvna5hwzp1";
      leaveDotGit = true;
      fetchSubmodules = false;
      postFetch = "cd $out && git tag ${rev}";
  