audio/mpdas need to be built with GCC. Otherwise it crashes when trying to communicate with last.fm. This is easily and 100% reproducible. May be this has something to do with optimization, however I was unable to turn it off (no -O2 in Makefile or pkgconfig output, howerver c++ is applying it). Original issue on github: https://github.com/hrkfdn/mpdas/issues/8
Plus, to get the scrobbler to work. mpdas has to be built without any compiler optimization (at least for me here). Building with -O2 was getting me the scrobbled that was unable to scroll (it was sending empty tags, they were declined by the last.fm).
Notify maintainer.
Can be closed. Updated port with bugfix is here: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=191770
Superseded by ports/191770.