Issue enabling qt backend on Opensuse Tumbleweed

[Lwfrancisco]

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So, let me preface this with saying I'm new to everything here except Linux itself. I'm new to Opensuse (though I've used a number of other distros), new to slint, new(ish) to gui development, and new to rust.

I'm just wanting to try a few of the available gui toolkits in rust to make a simple gui app to learn rust, gui development, and whatever gui toolkit I decide on. Slint has so far been the most annoying to set up. I've spent a few minutes each tackling the first few issues and while I am now able to run the examples (yay!) I am continually getting the "Qt is not available" and "qmake is not found in path" messages upon running "cargo build" in the examples. I know qt is not strictly necessary, but I'd like to get it working.

I'm running KDE and have installed the "devel-qt5" and "devel-qt6" patterns on opensuse, so I think I should have the necessary packages. How do I enable the qt backend, allow cargo to see qmake, and do I even need the qt5 devel package, or is qt6 sufficient?

I've attempted the following thusfar:

• On my system, qmake-qt5 or qmake6 are the commands to run qmake. I've attempted to set an alias qmake="qmake-qt5" but to no avail. I've also attempted this with qmake6.
• I've also attempted all 3 solutions found here (setting various environment variables to the header location, e.g. /usr/include/qt5) to help cargo find qt: https://docs.rs/qttypes/0.2.8/qttypes/#finding-qt

Thanks for any assistance you can offer!

[tronical]

Hi! I think @Montel had a somewhat similar issue in #1200 . Odd though that the the workaround that helped there and that you also tried (setting QT_INCLUDE_PATH and QT_LIBRARY_PATH) didn't work for you.

A bit of a shot in the dark (that shouldn't be required), but could it be that something was cached erroneously so that when you set QT_INCLUDE_PATH and QT_LIBRARY_PATH the build didn't even try again? Can you try removing your target/ sub-directory and see if that helps (in combination with setting the two environment variables)?