anchor.diff:      sha256 = "0wdr399jf64zzzsdvldhrwvnh5xpbghjvslr1j2cwr5y4i36znxf";
     };
   
  -  buildInputs = [ git python2Packages.python ];
  +  buildInputs = [
  +    git
  +    (python2Packages.python.withPackages
  +      (p: with p; [ setuptools tornado ]
  +        ++ stdenv.lib.optionals (!stdenv.isDarwin) [ pyxattr pylibacl fuse ]))
  +  ];
     nativeBuildInputs = [ pandoc perl makeWrapper ];
   
     postPatch = ''
  
positive.code: 
    postInstall = ''
      wrapProgram $out/bin/bup \
        --prefix PATH : ${git}/bin \
        --prefix PYTHONPATH : ${concatStringsSep ":" (map (x: "$(toPythonPath ${x})")
          (with python2Packages;
           [ setuptools tornado ]
           ++ stdenv.lib.optionals (!stdenv.isDarwin) [ pyxattr pylibacl fuse ]))}
    '';
  
    meta = {
  
negative.code: { stdenv, fetchFromGitHub, makeWrapper
  , perl, pandoc, python2Packages, git
  , par2cmdline ? null, par2Support ? true
  }:
  