Install qt4-default by entering the following commands in the terminal:
sudo apt update sudo apt install qt4-default
Description:
Qt 4 development defaults package
Qt is a cross-platform C++ application framework. Qt's primary feature is its rich set of widgets that provide standard GUI functionality. . This package sets Qt 4 to be the default Qt version to be used when using development binaries like qmake. It provides a default configuration for qtchooser, but does not prevent alternative Qt installations from being used. . This package should not be used for building Debian packages. Take a look at http://pkg-kde.alioth.debian.org/packagingqtstuff.html for more information.
Homepage: http://qt-project.org/
Version: 4:4.8.7+dfsg-7ubuntu1
Section: universe/libs