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Instructions to load CTK widgets in Qt Designer

Set the QT_PLUGIN_PATH environment variable to the .../CTK-build/CTK-build/bin path (that should contains a designer folder).
You might also have to add into the path the CTK plugins dependencies:
Set the LD_LIBRARY_PATH (or PATH on Windows) environment variable to the .../CTK-build/CTK-build/bin (suffixed by Release on Windows) path (that should contains files such as libCTKCore.so or libCTKWidgets.so)

If you built CTK with the VTK option, then you also need to add in your LD_LIBRARY_PATH (or PATH on Windows) environment variable the path to the VTK libraries (e.g. VTKCommon.dll). Those files are typically located in .../CTK-build/VTK-build/bin[/Release].

And if you built CTK with QtTesting, you also need to add the QtTesting-build/bin directory into your path environment variable.

Don't forget that on Windows, folders are separated using '\' and not '/'
Then you can start QtDesigner
You can troubleshoot by opening the "Help -> About Plugins" dialog within QtDesigner.

You can also troubleshoot library dependencies (-> what is missing in your LD_LIBRARY_PATH or PATH) by using ldd on linux or "Dependency Walker" on Windows.

Instructions to load CTK widgets in Qt Creator