Description of problem: https://src.fedoraproject.org/rpms/ncurses/c/e9317e9d5d60bbafccec65f4181e05425db1a13b?branch=rawhide removed the ABI v5 compatibility subpackages from ncurses. Would it be possible to provide these again, or are there specific concerns against this?
Nothing in Fedora is (or at least should be) using it. Why do you need it? There were some requests to bring it back before: bug #2129865, bug #2135400.
It's an external piece of software, not distributed with Fedora. symlinking so.5 -> so.6 does make it work, but manually messing around in the system like that feels ... wrong. The application is not maintained any more, so it will never get rebuilt.
You can put the symlink in some directory where only that application will find it, e.g. by setting LD_LIBRARY_PATH. Fedora is not supposed to (at least as I understand it) to carry old libraries forever. It has the latest versions and binary compatibility is not usually a concern. *** This bug has been marked as a duplicate of bug 2129865 ***