Ponce has revised his buildscript for version 3.4.2 , it's in the pipeline but not on slackbuilds.org yet. See
https://www.linuxquestions.org/quest...ml#post6466320
I've tried the script both on -stable and -current, works fine.
Dependencies (as before) are portmidi, soxr, rapidjson, portaudio, wxWidgets, libsbsms, portsmf.
EDIT: @chris.willing is right, lilv + suil are indeed new dependencies. Didn't noticed that since I already had them installed when building audacity.