anchor.diff:  
     libarchive = fetchgit rec {
       url = "https://github.com/libarchive/libarchive.git";
  -    rev = "v3.3.3";
  -    sha256 = "165imgfmizpi4ffpiwfs8gxysn6lw3y1fxj5rga98filkl7hxs31";
  +    rev = "v3.4.3";
  +    sha256 = "00yrzy2129vr4nfhigd91651984sl447dyfjfz26dmzvna5hwzp1";
       leaveDotGit = true;
       fetchSubmodules = false;
       postFetch = "cd $out && git tag ${rev}";
  
positive.code:     git config --global url."file://${google-test}".insteadOf "${google-test.url}"
      git config --global url."file://${date}".insteadOf "${date.url}"
  
      substituteInPlace Builds/CMake/deps/Sqlite.cmake --replace "URL ${sqlite3.url}" "URL ${sqlite3}"
    '';
  
  
negative.code: 
    lz4 = fetchgit rec {
      url = "https://github.com/lz4/lz4.git";
      rev = "v1.9.2";
      sha256 = "0322xy2vfhxkb8akas7vwajjgcigq1q8l9f5fnfmavcsd6kmxmgg";
      leaveDotGit = true;
      fetchSubmodules = false;
      postFetch = "cd $out && git tag ${rev}";
  