anchor.diff:    patchPhase = ''
       rm xonsh/winutils.py
       sed -i -e "s|/bin/ls|${coreutils}/bin/ls|" tests/test_execer.py
  +    sed -ie 's|test_win_ipconfig|_test_win_ipconfig|g' tests/test_execer.py
  +    sed -ie 's|test_ipconfig|_test_ipconfig|g' tests/test_execer.py
       rm tests/test_main.py
       rm tests/test_man.py
     '';
  
positive.code: 
  python3Packages.buildPythonApplication rec {
    name = "xonsh-${version}";
    version = "0.3.4";
  
    src = fetchFromGitHub {
      owner = "scopatz";
      repo = "xonsh";
      rev = version;
      sha256= "13inkj0vs8nqdghp3j19dardawfsdmcsfzsp77hlwavmw7sqjxzi";
    };
  
    ## The logo xonsh prints during build contains unicode characters, and this
  
negative.code:     HOME=$TMPDIR nosetests -x
    '';
  
    buildInputs = with python3Packages; [ glibcLocales nose pytest ];
    propagatedBuildInputs = with python3Packages; [ ply prompt_toolkit ];
  
    meta = with stdenv.lib; {
      description = "A Python-ish, BASHwards-compatible shell";
      homepage = "http://xonsh.org";
      license = licenses.bsd3;
      maintainers = with maintainers; [ spwhitt garbas vrthra ];
      platforms = platforms.all;
    };
  
  