anchor.diff:  
     buildInputs = [
       acl
  +    libb2
       lz4
       openssl
  +    zstd
     ];
   
     propagatedBuildInputs = [
  
positive.code: , setuptools-scm
  
  , acl
  , llfuse
  , lz4
  , msgpack-python
  , openssl
  }:
  
  let
    version = "1.1.3";
  in
  buildPythonPackage rec {
    name = "borgbackup-${version}";
  
negative.code:   src = fetchPyPi {
      package = "borgbackup";
      inherit version;
      sha256 = "22a4a53840886180e87de5636356f29e491209365861007c31d7f18220c72cb2";
    };
  
    nativeBuildInputs = [
  