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: 
    nudb = fetchgit rec {
      url = "https://github.com/CPPAlliance/NuDB.git";
      rev = "2.0.1";
      sha256 = "10hlp2k7pc0c705f8sk0qw6mjfky0k08cjhh262bbjvp9fbdc7r4";
      leaveDotGit = true;
      fetchSubmodules = true;
      postFetch = "cd $out && git tag ${rev}";
  
negative.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 "http://www.sqlite.org/2018/sqlite-amalgamation-3260000.zip" "" 
      substituteInPlace Builds/CMake/deps/Sqlite.cmake --replace "https://www2.sqlite.org/2018/sqlite-amalgamation-3260000.zip" "" 
      substituteInPlace Builds/CMake/deps/Sqlite.cmake --replace "http://www2.sqlite.org/2018/sqlite-amalgamation-3260000.zip" "" 
      substituteInPlace Builds/CMake/deps/Sqlite.cmake --replace "URL ${sqlite3.url}" "URL ${sqlite3}"
    '';
  
  