anchor.diff:      EOF
     '';
   
  -  installCheckPhase = let
  -    modules = [
  -      "PyQt5"
  -      "PyQt5.QtCore"
  -      "PyQt5.QtQml"
  -      "PyQt5.QtWidgets"
  -      "PyQt5.QtGui"
  -    ]
  +  # Checked using pythonImportsCheck
  +  doCheck = false;
  +
  +  pythonImportsCheck = [
  +    "PyQt5"
  +    "PyQt5.QtCore"
  +    "PyQt5.QtQml"
  +    "PyQt5.QtWidgets"
  +    "PyQt5.QtGui"
  +  ]
       ++ lib.optional withWebSockets "PyQt5.QtWebSockets"
       ++ lib.optional withWebKit "PyQt5.QtWebKit"
       ++ lib.optional withMultimedia "PyQt5.QtMultimedia"
       ++ lib.optional withConnectivity "PyQt5.QtConnectivity"
  -    ;
  -    imports = lib.concatMapStrings (module: "import ${module};") modules;
  -  in ''
  -    echo "Checking whether modules can be imported..."
  -    ${python.interpreter} -c "${imports}"
  -  '';
  -
  -  doCheck = true;
  +  ;
   
     enableParallelBuilding = true;
   
  
positive.code: 
    propagatedBuildInputs = [
      dbus-python
      sip
    ] ++ lib.optional (!isPy3k) enum34;
  
    patches = [
      # Fix some wrong assumptions by ./configure.py
  
negative.code: 
    inherit (pythonPackages) buildPythonPackage python isPy3k dbus-python enum34;
  
    sip = if isPy3k then
      pythonPackages.sip_5
    else
      (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
        '';
      });
  
    pyqt5_sip = buildPythonPackage rec {
      pname = "PyQt5_sip";
      version = "12.8.1";
  
      src = pythonPackages.fetchPypi {
        inherit pname version;
        sha256 = "30e944db9abee9cc757aea16906d4198129558533eb7fadbe48c5da2bd18e0bd";
      };
  
      # There is no test code and the check phase fails with:
      # > error: could not create 'PyQt5/sip.cpython-38-x86_64-linux-gnu.so': No such file or directory
      doCheck = false;
    };
  
  in buildPythonPackage rec {
    pname = "PyQt5";
  