Qt is not a GUI toolkit. The GUI toolkit is just a part of Qt, along with the Networking, Scripting, Xml, Core, Plugin (platform-independent handling of shared libraries) and plenty of other modules. I think your message was based on the thought that Qt is just a GUI toolkit, but in fact it is not. See a full list of Qt modules here:
http://doc.qt.nokia.com/latest/modules.html . It would be quite strange to have Qt available and exclude wide parts of it simultaneously. Also, switching to another GUI toolkit can be considered as a step back. Qt is GPL, so there is nothing to fear from.