LMMS is very similar to FruityLoops Studio (for Windows) ... a Digital Audio Workstation (DAW). It build alright from the spec of the previous version with very little tweaking. It launches as well but ... (and there's always a but) apparently the plugin libraries are on /usr//usr/lib64/lmms/ so naturally they are not loaded because the libraries were installed in their correct destination /usr/lib64/lmms/ (see screenshot)
I've looked at the specfile and there is no indication that there's anything wrong in there. I'm sure.
I've also taken a look at the tar.xz archive and ... opened a few files ... but there's just too many. I'm pretty certain that the offending extra /usr/ that gets prefixed is somewhere there but I'll start pulling my hair out if I don't find it. I know I still have a lot to learn about packaging. But is there an easy way to look for this file and make the diff so I can just create a patch?
I just noted there was a patch for the CMakeList.txt on 0.4.10. I'll check that out first.