Install libqt4-qt3support by entering the following commands in the terminal:
sudo apt update sudo apt install libqt4-qt3support
Description:
Qt 3 compatibility library for Qt 4
Qt is a cross-platform C++ application framework. Qt's primary feature is its rich set of widgets that provide standard GUI functionality. . The Qt3Support module provides classes that ease porting from Qt 3 to Qt 4. . It allows applications designed to use deprecated Qt 3 classes and functions to work with Qt 4, with help from the qt3to4 porting tool found in the libqt4-dev-bin package.
Homepage: http://qt-project.org/
Version: 4:4.8.7+dfsg-7ubuntu1
Section: universe/libs