anchor.diff:  
     nudb = fetchgit rec {
       url = "https://github.com/CPPAlliance/NuDB.git";
  -    rev = "2.0.3";
  -    sha256 = "0imd9sh6knydwa3pxa5bbvjs3bmb8650dnsvj04qgns6bynwlqh1";
  +    rev = "2.0.5";
  +    sha256 = "02zbd07qvdjjsm4ivvhxah5n466bncvm6m03vmq0qdbbrlnp6s37";
       leaveDotGit = true;
       fetchSubmodules = true;
       postFetch = "cd $out && git tag ${rev}";
  
positive.code:   };
  in stdenv.mkDerivation rec {
    pname = "rippled";
    version = "1.6.0";
  
    src = fetchgit {
      url = "https://github.com/ripple/rippled.git";
      rev = version;
      sha256 = "176i3dm98zp5jllslpzfhh52bd2lapq9i8r7m45v8sg9icvsmyz7";
      leaveDotGit = true;
      fetchSubmodules = true;
    };
  
negative.code: 
    rocksdb = fetchgit rec {
      url = "https://github.com/facebook/rocksdb.git";
      rev = "v6.7.3";
      sha256 = "16qb636qs2yxqmz30hmvq8mllf038s80p37b0vyc0bazwlr93d9z";
      deepClone = true;
      fetchSubmodules = false;
      leaveDotGit = true;
  