anchor.diff:        --prefix PYTHONPATH : "$PYTHONPATH" \
         --prefix GI_TYPELIB_PATH : "$GI_TYPELIB_PATH"
   
  -    mkdir -p $out/lib/udev/rules.d
  -    cp rules.d/*.rules $out/lib/udev/rules.d/
  +    install -Dm644 -t $out/etc/udev/rules.d rules.d/*.rules
     '';
   
     enableParallelBuilding = true;
  -  meta = with stdenv.lib; {
  +
  +  meta = with lib; {
       description = "Linux devices manager for the Logitech Unifying Receiver";
       longDescription = ''
         Solaar is a Linux device manager for Logitech’s Unifying Receiver
  
positive.code: {fetchFromGitHub, stdenv, gtk3, pythonPackages, gobject-introspection}:
  pythonPackages.buildPythonApplication rec {
    pname = "solaar-unstable";
    version = "2019-01-30";
  
  
negative.code:     sha256 = "0xg181xcwzzs8pdqvjrkjyaaga7ir93hzjvd17j9g3ns8xfj2mvr";
    };
  
    propagatedBuildInputs = with python3Packages; [ gobject-introspection gtk3 pygobject3 pyudev ];
  
    postInstall = ''
      wrapProgram "$out/bin/solaar" \
        --prefix PYTHONPATH : "$PYTHONPATH" \
  