Well, what do you need to know?
I've got SMTube and SMPlayer packages building in my own Jessie and Stretch OBS repo:
https://build.opensuse.org/package/show ... t/smplayerSince I'm l̶a̶z̶y̶ energy-efficient, I managed to add a little bit to the packages so they automatically build with qt 4 on Jessie, but qt 5 on Stretch, to take advantage of the HDPI support there. You can take a look at the sources by clicking on the "Debian_9.0" link on the right, then the "go to download repository" link, which goes to the repo where you can directly download the source files and finished packages.
Maybe rvm would like to modernize his builds to the current preferred "debhelper" that I've copied from Debian...his current method is being deprecated.