Qsynth uses wrong qt version

Support Software & Applications
1

Hello everyone,

I have a problem with different qt versions on my computer and would be glad about some help.

I stumbled over this when trying to use qsynth, which wouldn’t start anymore, that means: The gui appears but doesn’t respond. When started from the terminal, it gives this output:

qt.core.plugin.loader: In /usr/lib/qt/plugins/platforms/libqeglfs.so:
  Plugin uses incompatible Qt library (5.15.0) [release]
qt.core.plugin.loader: In /usr/lib/qt/plugins/platforms/libqlinuxfb.so:
  Plugin uses incompatible Qt library (5.15.0) [release]
qt.core.plugin.loader: In /usr/lib/qt/plugins/platforms/libqminimal.so:
  Plugin uses incompatible Qt library (5.15.0) [release]
qt.core.plugin.loader: In /usr/lib/qt/plugins/platforms/libqminimalegl.so:
  Plugin uses incompatible Qt library (5.15.0) [release]
qt.core.plugin.loader: In /usr/lib/qt/plugins/platforms/libqoffscreen.so:
  Plugin uses incompatible Qt library (5.15.0) [release]
qt.core.plugin.loader: In /usr/lib/qt/plugins/platforms/libqvnc.so:
  Plugin uses incompatible Qt library (5.15.0) [release]
qt.core.plugin.loader: In /usr/lib/qt/plugins/platforms/libqwayland-egl.so:
  Plugin uses incompatible Qt library (5.15.0) [release]
qt.core.plugin.loader: In /usr/lib/qt/plugins/platforms/libqwayland-generic.so:
  Plugin uses incompatible Qt library (5.15.0) [release]
qt.core.plugin.loader: In /usr/lib/qt/plugins/platforms/libqwayland-xcomposite-egl.so:
  Plugin uses incompatible Qt library (5.15.0) [release]
qt.core.plugin.loader: In /usr/lib/qt/plugins/platforms/libqwayland-xcomposite-glx.so:
  Plugin uses incompatible Qt library (5.15.0) [release]
qt.core.plugin.loader: In /usr/lib/qt/plugins/platforms/libqxcb.so:
  Plugin uses incompatible Qt library (5.15.0) [release]

I found out that qsynth depends on qt6, which appearently is installed, but while the qt5 libraries can be found under /usr/lib/qt/, the qt6 libraries are in /usr/lib/qt6/. All qt packages on my system are installed as dependencies from the official repositories.

Is there a way to tell qsynth where to look for the right libraries? Or any other solution for my problem?

Thanks in advance!

2

Looks like it’s the plugins that use qt5, not the application itself…

3

Hello Strit,

thanks for your reply!

Well, as much as I understand this, these are plugins of qt, not plugins of the application and I don’t think that it’s possible to deactivate them in the application. To be sure I moved away all configuration files of qsynth and tried again, but this doesn’t change anything.