Mhmm, as mentioned I'm an absolute novice so I don't get it why this should help.

To what I know, write access to /usr/local is only possible by root by default. Changing this would also require root privileges. So I would end up setting SUID - which I'm not allowed for Jolla Harbour. In addition for Harbour the directory structure is pretty much strict and bans /usr/local as far as I understand it. And even if I said I'll only publish on OpenRepos from now and ignore the Harbour rules, it would be quite of a hack which I don't like to do... If I missed anything or simply don't know crucial details, please let me know. I'm willing to learn.