Protobuf version conflicts with Qt

Question

I\'m trying to use protobufs v 3.3.2 with Qt 5.9.1. This works with some Qt applications, but only if they are command line programs. Once I create a GUI application with Qt and

Answer 1

You can find here a discussion about the same issue and they talk about an interesting workaround.

It seems that this error is caused by the library libqgtk3.so located in /opt/Qt/5.9/gcc_64/plugins/platformthemes. If you don't need it in your project you can rename/remove it to make the error go away.

If you are using CMake as a build system you also need to comment all the lines in the file /opt/Qt/5.9/gcc_64/lib/cmake/Qt5Gui/Qt5Gui_QGtk3ThemePlugin.cmake to avoid configure issues.

To add on, the real problem comes from the library libmir which depends on the the libprotobuf. You may run on this problem whenever you try to use recent tensorflow with libgtk3.0 because of this hard dependency. As libmir depends on the system libprotobuf which is normally behind the version in use by tensorflow (which downloads its own version from the repository).

The good news, this BUG on libgtk was reported and fixed however, to use the fixed version you have to move to libgtk3.0 3.22 (see BUG report).