Still heavily reliant on KDELibs4Support right now. Known gotchas:
- Tabs-on-left is missing (needs rewrite, I'll be working on this).
- Bookmarks support is missing (porting lazyness).
- DCC support is missing (more lazyness ... buscher?).
- Encryption support is missing (*probably* just a buildsystem fix away).
- Config dialog is ugly (due to KPageDialog changes; needs love anyway).
- Tiny things disabled all over the place (see below).

Now is your time to shine and help out! If you want to help with
porting:
- ... pick some of the million deprecation warnings emitted during port
  and fix them.
- ... grep the codebase for "FIXME KF5 port" comments and address them.