anchor.diff:  
     inherit (pythonPackages) buildPythonPackage python isPy3k dbus-python enum34;
   
  -  sip = pythonPackages.sip.override { sip-module = "PyQt5.sip"; };
  +  sip = (pythonPackages.sip.override { sip-module = "PyQt5.sip"; }).overridePythonAttrs(oldAttrs: {
  +    # If we install sip in another folder, then we need to create a __init__.py as well
  +    # if we want to be able to import it with Python 2.
  +    # Python 3 could rely on it being an implicit namespace package, however,
  +    # PyQt5 we made an explicit namespace package so sip should be as well.
  +    postInstall = ''
  +      cat << EOF > $out/${python.sitePackages}/PyQt5/__init__.py
  +      from pkgutil import extend_path
  +      __path__ = extend_path(__path__, __name__)
  +      EOF
  +    '';
  +  });
   
   in buildPythonPackage rec {
  -  pname = "PyQt";
  -  version = "5.11.3";
  +  pname = "pyqt";
  +  version = "5.13.0";
     format = "other";
   
     src = fetchurl {
  -    url = "mirror://sourceforge/pyqt/PyQt5/PyQt-${version}/PyQt5_gpl-${version}.tar.gz";
  -    sha256 = "0wqh4srqkcc03rvkwrcshaa028psrq58xkys6npnyhqxc0apvdf9";
  +    url = "https://www.riverbankcomputing.com/static/Downloads/PyQt5/${version}/PyQt5_gpl-${version}.tar.gz";
  +    sha256 = "1ydgdz28f1v17qqz3skyv26k5l0w63fr4dncc5xm49jr2gjzznqc";
     };
   
     outputs = [ "out" "dev" ];
   
  -  nativeBuildInputs = [ pkgconfig qmake lndir sip ];
  -
  -  buildInputs = [ dbus sip ];
  -
  -  propagatedBuildInputs = [ qtbase qtsvg qtwebengine dbus-python ]
  -    ++ lib.optional (!isPy3k) enum34
  +  nativeBuildInputs = [
  +    pkgconfig
  +    qmake
  +    lndir
  +    sip
  +    qtbase
  +    qtsvg
  +    qtdeclarative
  +    qtwebchannel
  +  ]
       ++ lib.optional withConnectivity qtconnectivity
       ++ lib.optional withWebKit qtwebkit
  -    ++ lib.optional withWebSockets qtwebsockets;
  +    ++ lib.optional withWebSockets qtwebsockets
  +  ;
  +
  +  buildInputs = [
  +    dbus
  +    qtbase
  +    qtsvg
  +    qtdeclarative
  +  ]
  +    ++ lib.optional withConnectivity qtconnectivity
  +    ++ lib.optional withWebKit qtwebkit
  +    ++ lib.optional withWebSockets qtwebsockets
  +  ;
  +
  +  propagatedBuildInputs = [
  +    dbus-python
  +    sip
  +  ] ++ lib.optional (!isPy3k) enum34;
   
     patches = [
       # Fix some wrong assumptions by ./configure.py
       # TODO: figure out how to send this upstream
       ./pyqt5-fix-dbus-mainloop-support.patch
     ];
  +
  +  passthru = {
  +    inherit sip;
  +  };
   
     configurePhase = ''
       runHook preConfigure
  
positive.code:     for i in $out/bin/*; do
        wrapProgram $i --prefix PYTHONPATH : "$PYTHONPATH"
      done
    '';
  
    enableParallelBuilding = true;
  
  
negative.code: { lib, fetchurl, pythonPackages, pkgconfig
  , dbus
  , qmake, lndir
  , qtbase
  , qtsvg
  , qtdeclarative
  , qtwebchannel
  , withConnectivity ? false, qtconnectivity
  , withWebKit ? false, qtwebkit
  , withWebSockets ? false, qtwebsockets
  