How to rebuild Kdenlive on -current?

Hi, the official package for Kdenlive on current misses several options (export aac, tracking plugin, etc). Right now I'm using the AppImage as it seems to correctly detects my recompiled ffmpeg with proprietary codecs and opencv (or maybe use its own), but I would like to rebuild the official package to keep the system clean. The problem is, I don't quite get how to use the slackbuild in source tree since it seems to want to recompile every single component of KDE. Is there a way to just download and recompile kdenlive? How do I set the configure parameters then?