I installed the latest Qt version (5.5.1), and Qt creator worked fine, I could build programs with it.
However, after I installed cmake, downloaded opencv from source, and built it, Qt creator no longer works. It silently crashes on startup, and if I start it from the console, it just says "Segmentation fault", nothing more.
I didn't put cmake and opencv in the title of this question, because I'm not sure if they are really the culprits. The following happened after I successfully used Qt:
I tried to install a Radeon driver to use a second screen, by following https://wiki.debian.org/ATIProprietary , but it didn't work. (the installation was apparently successful, but my secondary video card is still not detected)
I installed cmake, together with its gui (called cmake-gui)
I downloaded the opencv source, and successfully built it, by specifying the 5.5.1 Qt folders as the location of Qt
During all of the above, one update was performed on the system. (
I'm suspecting cmake, because its gui uses Qt4, so it might have installed some stuff from Qt4 which might be causing conflicts - however, it seems that Qt4 was already installed with KDE, because I've seen it in the "software management".
I tried deleting and installing Qt5.5.1 again, with no effect.
I'm using KDE, and I cannot even uninstall Qt5.5.1 properly. It doesn't appear in the
Software management - System settings, and when I right-click on its shortcut in the "start menu", I get the option to uninstall, but I'm greeted with
The file could not be found in any installed package - so apparently my system doesn't seem to see Qt at all. (I can't even find any way to remove the shortcut, or even find where the executable is by right clicking, I had to locate the application manually - either there are serious UX issues, or I'm not experienced enough with the UI of KDE)
I'm using debian 8 (jessie)