anchor.diff: -{ stdenv, python3Packages, acl, libb2, lz4, openssl, openssh }:
  +{ stdenv, python3Packages, acl, libb2, lz4, zstd, openssl, openssh }:
   
   python3Packages.buildPythonApplication rec {
     pname = "borgbackup";
  
positive.code:     sphinx guzzle_sphinx_theme
    ];
    buildInputs = [
      libb2 lz4 openssl python3Packages.setuptools_scm
    ] ++ stdenv.lib.optionals stdenv.isLinux [ acl ];
    propagatedBuildInputs = with python3Packages; [
      cython msgpack-python
  
negative.code:     export BORG_OPENSSL_PREFIX="${openssl.dev}"
      export BORG_LZ4_PREFIX="${lz4.dev}"
      export BORG_LIBB2_PREFIX="${libb2}"
      export BORG_LIBZSTD_PREFIX="${zstd}"
    '';
  
    makeWrapperArgs = [
  