{
  lib,
  buildPythonPackage,
  fetchPypi,
  pbr,
  pip,
  pkgs,
  stevedore,
  virtualenv,
  virtualenv-clone,
  python,
}:

buildPythonPackage rec {
  pname = "virtualenvwrapper";
  version = "6.1.0";
  format = "setuptools";

  src = fetchPypi {
    inherit pname version;
    hash = "sha256-1Ge+rFpEvgD7XNG88zI5jD2rX7O9OveBXqhrTWuz06Q=";
  };

  # pip depend on $HOME setting
  preConfigure = "export HOME=$TMPDIR";

  buildInputs = [
    pbr
    pip
    pkgs.which
  ];
  propagatedBuildInputs = [
    stevedore
    virtualenv
    virtualenv-clone
  ];

  postPatch = ''
    for file in "virtualenvwrapper.sh" "virtualenvwrapper_lazy.sh"; do
      substituteInPlace "$file" --replace "which" "${pkgs.which}/bin/which"

      # We can't set PYTHONPATH in a normal way (like exporting in a wrapper
      # script) because the user has to evaluate the script and we don't want
      # modify the global PYTHONPATH which would affect the user's
      # environment.
      # Furthermore it isn't possible to just use VIRTUALENVWRAPPER_PYTHON
      # for this workaround, because this variable is well quoted inside the
      # shell script.
      # (the trailing " -" is required to only replace things like these one:
      # "$VIRTUALENVWRAPPER_PYTHON" -c "import os,[...] and not in
      # if-statements or anything like that.
      # ...and yes, this "patch" is hacky :)
      substituteInPlace "$file" --replace '"$VIRTUALENVWRAPPER_PYTHON" -' 'env PYTHONPATH="$VIRTUALENVWRAPPER_PYTHONPATH" "$VIRTUALENVWRAPPER_PYTHON" -'
    done
  '';

  postInstall = ''
        # This might look like a dirty hack but we can't use the makeWrapper function because
        # the wrapped file were then called via "exec". The virtualenvwrapper shell scripts
        # aren't normal executables. Instead, the user has to evaluate them.

        for file in "virtualenvwrapper.sh" "virtualenvwrapper_lazy.sh"; do
          local wrapper="$out/bin/$file"
          local wrapped="$out/bin/.$file-wrapped"
          mv "$wrapper" "$wrapped"

          # WARNING: Don't indent the lines below because that would break EOF
          cat > "$wrapper" << EOF
    export PATH="${python}/bin:\$PATH"
    export VIRTUALENVWRAPPER_PYTHONPATH="$PYTHONPATH:$(toPythonPath $out)"
    source "$wrapped"
    EOF

          chmod -x "$wrapped"
          chmod +x "$wrapper"
        done
  '';

  meta = with lib; {
    description = "Enhancements to virtualenv";
    homepage = "https://pypi.python.org/pypi/virtualenvwrapper";
    license = licenses.mit;
  };
}
