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diff --git a/sources/shiboken2/shibokenmodule/support/signature/loader.py b/sources/shiboken2/shibokenmodule/support/signature/loader.py
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+#############################################################################
+##
+## Copyright (C) 2018 The Qt Company Ltd.
+## Contact: https://www.qt.io/licensing/
+##
+## This file is part of Qt for Python.
+##
+## $QT_BEGIN_LICENSE:LGPL$
+## Commercial License Usage
+## Licensees holding valid commercial Qt licenses may use this file in
+## accordance with the commercial license agreement provided with the
+## Software or, alternatively, in accordance with the terms contained in
+## a written agreement between you and The Qt Company. For licensing terms
+## and conditions see https://www.qt.io/terms-conditions. For further
+## information use the contact form at https://www.qt.io/contact-us.
+##
+## GNU Lesser General Public License Usage
+## Alternatively, this file may be used under the terms of the GNU Lesser
+## General Public License version 3 as published by the Free Software
+## Foundation and appearing in the file LICENSE.LGPL3 included in the
+## packaging of this file. Please review the following information to
+## ensure the GNU Lesser General Public License version 3 requirements
+## will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+##
+## GNU General Public License Usage
+## Alternatively, this file may be used under the terms of the GNU
+## General Public License version 2.0 or (at your option) the GNU General
+## Public license version 3 or any later version approved by the KDE Free
+## Qt Foundation. The licenses are as published by the Free Software
+## Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+## included in the packaging of this file. Please review the following
+## information to ensure the GNU General Public License requirements will
+## be met: https://www.gnu.org/licenses/gpl-2.0.html and
+## https://www.gnu.org/licenses/gpl-3.0.html.
+##
+## $QT_END_LICENSE$
+##
+#############################################################################
+
+from __future__ import print_function, absolute_import
+
+"""
+loader.py
+
+The loader has to lazy-load the signature module and also provides a few
+Python modules to support Python 2.7 .
+
+This file was originally directly embedded into the C source.
+After it grew more and more, I now prefer to have it as Python file.
+The remaining stub loader in the C source is now only a short string.
+
+This version does no longer use an embedded .zip file but is a package.
+The old code without a package but with zip compression can still be found
+at https://codereview.qt-project.org/#/c/203533/ for reference.
+"""
+
+import sys
+import os
+import traceback
+import types
+from contextlib import contextmanager
+from distutils.sysconfig import get_python_lib
+
+"""
+A note on the import problem (solved):
+
+During the tests, the shiboken build structure has the layout
+
+    shiboken2/shibokenmodule/shiboken2.abi3.so
+
+and the name "shiboken2" in sys.modules points directly to the binary
+file, hiding the outer shiboken2 module.
+
+To fix that, we temporarily remove the binary from sys.path,
+do the needed imports and then restore the binary.
+This action was put into a context manager for readability.
+"""
+
+# On Python 2, we only have ImportError, which is way too coarse.
+# When problems occour, please use Python 3, because it has the finer
+# ModuleNotFoundError.
+
+try:
+    ModuleNotFoundError
+except NameError:
+    ModuleNotFoundError = ImportError
+
+@contextmanager
+def ensure_import_support():
+    # Make sure that we always have the shiboken containing package first.
+    # This is sometimes hidden by the ctest paths.
+    # We adjust the path in a way that the support folder comes first.
+    # This can be in "shiboken2/support" or in "shibokenmodule/support",
+    # so we use the "support" folder as toplevel.
+    sbk_support_dir = os.path.abspath(os.path.join(__file__, "..", "..", ".."))
+    sys.path.insert(0, sbk_support_dir)
+    sbk = "shiboken2"
+    save_sbk = sys.modules.pop(sbk) if sbk in sys.modules else None
+    # make sure that we get at the support folder
+    try:
+        import support
+        yield
+    except Exception as e:
+        print("Problem importing support:")
+        print(e)
+        traceback.print_exc()
+        sys.stdout.flush()
+        sys.exit(-1)
+    if save_sbk:
+        sys.modules[sbk] = save_sbk
+    sys.path.pop(0)
+
+
+with ensure_import_support():
+    # We store all needed modules in signature_loader.
+    # This way, they are always accessible.
+    import signature_loader
+
+    if sys.version_info >= (3,):
+        import typing
+        import inspect
+    else:
+        import inspect
+        namespace = inspect.__dict__
+        from support.signature import typing
+        from support.signature import backport_inspect as inspect
+        _doc = inspect.__doc__
+        inspect.__dict__.update(namespace)
+        inspect.__doc__ += _doc
+        # force inspect to find all attributes. See "heuristic" in pydoc.py!
+        inspect.__all__ = list(x for x in dir(inspect) if not x.startswith("_"))
+
+    def put_into_loader_package(module, loader=signature_loader):
+        # Note: the "with" statement hides that we are no longer in a
+        # global context, but inside ensure_import_support. Therefore,
+        # we need to explicitly pass the signature_loader in.
+
+        # take the last component of the module name
+        name = module.__name__.rsplit(".", 1)[-1]
+        # allow access as signature_loader.typing
+        setattr(loader, name, module)
+        # put into sys.modules as a package to allow all import options
+        fullname = "{}.{}".format(loader.__name__, name)
+        sys.modules[fullname] = module
+
+    put_into_loader_package(typing)
+    put_into_loader_package(inspect)
+    from support.signature import mapping as sbk_mapping
+    sbk_mapping.__name__ = "sbk_mapping"
+    put_into_loader_package(sbk_mapping)
+    # We may or may not use PySide.
+    try:
+        from PySide2.support.signature import mapping
+    except ModuleNotFoundError:
+        mapping = sbk_mapping
+        mapping.__name__ = "mapping"
+    put_into_loader_package(mapping)
+    from support.signature import layout
+    put_into_loader_package(layout)
+    from support.signature.lib import enum_sig
+    put_into_loader_package(enum_sig)
+    from support.signature.parser import pyside_type_init
+
+
+# Note also that during the tests we have a different encoding that would
+# break the Python license decorated files without an encoding line.
+
+# name used in signature.cpp
+def create_signature(props, key):
+    return layout.create_signature(props, key)
+
+# name used in signature.cpp
+def seterror_argument(args, func_name):
+    return errorhandler.seterror_argument(args, func_name)
+
+# end of file