It is possible that you are missing some libraries. Looking through the CVS log for the port Makefile some additional missing Qt library specifications were recently added to -current as dependencies: QtGui, QtNetwork, QtSql, and QtXml. Other added WANTLIBs were ffw3f, gpod, and madsamplerate. See
http://www.openbsd.org/cgi-bin/cvswe...st.fm/Makefile
There could be other reasons for your difficulties, of course. You might contact the ports@ mailing list, it is a much, much larger community than this one, or you might contact the port maintainer, his name and Email address are in the Makefile referenced above.
(I don't use this port, which is only six months old. I use audio/pianobar instead.)