Notepadqq is not maintained upstream. It uses qt5-webkit which is also unmaintained upstream and insecure. This is why notepadqq was removed from the repo. Qt5 and its libraries will be removed from Solus over time as applications in the repo migrate to Qt6 so even if you get it to build, its not going to continue to build or run.

My advice is to not use notepadqq or if you insist, use the flatpak.
flatpak install flathub com.notepadqq.Notepadqq

    alfisya I've never used that system before ... but honestly I don't get the over-complication .... why it's not possible building stuff the old/usual way with ./configure, make etc. Why do I need freaking Python to build LLVM, dedicate separate space on my disk, just in order to build a C/C++ (NOT PYTHON) packages .... it's so confusing, but anyways ...
    Is there any non-llvm.org guide for setting it up that us non-developer folk can grasp?

    Anyways, thanks for the feedback/help.

        greenygrime I've never used that system before ... but honestly I don't get the over-complication

        Maybe another distro will better fits your need

            In this case with notpadqq and gimp wouldn't it be easier to head over at flathub and install the flatpaks?

              AlphaElwedritsch No, I finally found the one that actually works. It's ok if I have to wait for GIMP package to update in repository.
              Also what a 'constructive' reply lol .... Maybe you could've tried to convince me why clang is better or whatever instead of 'find another distro' XD

                  greenygrime I didn't say that to dissuade you from Solus. On the contrary. Everyone is welcome and a growing community is all the better.
                  I said that because I have (had) the impression that your requirements for packages are not (fully) covered by Solus and that compiling them yourself is (can be) very tiring and time-consuming in the long run.
                  Therefore again. Welcome and sorry if it came across wrong...

                    greenygrime All the flatpak packages I use are super stable. I've never had any problems with them. In terms of safety/Security, I also don't know what speaks against it (should speak against it)
                    I would suggest. Just try it out and form your own opinion and experience in your setup. Nothing ventured, nothing gained 😉