anchor.diff:  { lib, stdenv
  -, fetchpatch
   , fetchurl
   , pythonPackages
   , librsync
  
positive.code:     # to make the testing code stop assuming it is run from the source directory.
      ./use-installed-scripts-in-test.patch
    ] ++ lib.optionals stdenv.isLinux [
      ./linux-disable-timezone-test.patch
    ];
  
    nativeBuildInputs = [
      makeWrapper
      gettext
      pythonPackages.wrapPython
    ];
    buildInputs = [
      librsync
  
negative.code: , par2cmdline
  , util-linux
  , rsync
  , makeWrapper
  , gettext
  }:
  