[PyQt] PyQt v5.12 with dbus_message_get_allow_interactive_authorization

[Valentin Valls]

Hi,

I recently tried the last PyQt version 5.12 and encounter a critical
problem.

Applications do not start anymore and this message is displayed instead:

```
python3.5: relocation error:
/home/valls/.local/lib/python3.5/site-packages/PyQt5/Qt/plugins/platforms/../../lib/libQt5DBus.so.5:
symbol dbus_message_get_allow_interactive_authorization, version
LIBDBUS_1_3 not defined in file libdbus-1.so.3 with link time reference
```

I found a similar messages on
https://blog.qt.io/blog/2018/12/06/qt-creator-4-8-0-released/

and on https://bugreports.qt.io/browse/QTBUG-72507

No idea if it is Qt or PyQt related.

I am using Debian8, with an own compiled Python 3.5.

According to comment, one solution is to recompile LIBDBUS with an
up-to-date version. Is somebody encounter the same problem? And found a
more convenient solution?

Regards,
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