qt4 (a C++ graphical user interface toolkit, legacy version) Qt is a complete and well-developed object-oriented framework for developing graphical user interface (GUI) applications using C++. This is an older 'legacy' version of Qt, only intended to support older applications that have not yet been ported to Qt5. Don't use this for developing new code. If you're a SBo maintainer working on a script that requires qt4, see README_SBo.txt for some helpful hints. This qt4 does *not* include qt4-webkit, and there is no separate qt4-webkit SlackBuild. qt4-webkit is outdated, EOLed, and has security issues that will never be fixed. Nobody should still be using it at this late date.