Yer the man!  Your buster pre-built binary package worked beautifully.  Grabbed it with wget, installed as per your instructions, restarted rbfeeder service and voila, now we're cookin: 
MLAT active (5 stations synced)Did i happen to just sync with you -- EXTRPI007137 ?
Thanks a million.  After borking my first attempt messing with FR24 on top of the PiAware image i was hesitant to begin adding multiple versions of the same stuff, be it dump1090 or mlat clients, as i obviously have very little clue what i'm doing here.
Any suggestions for a beginner on how to continue expanding the footprint, or usages of this data?  Started with the PiAware 3.8.1 image on an RPi3B (non-plus) and now have the following services:
- PiAware SkyAware
- FlightRadar24
- ADSBexchange
- PlaneFinder.net client
- RadarBox
Am i missing anything pertinent?  It's just a wild guess, but I suspect a Pi Zero W might eventually struggle with its single CPU core, but 512MB of RAM seems that it would be more than enough.  Currently only using 124MB/976MB on Raspbian 10 Lite (buster) granted i'm barely tracking double digit aircraft at the moment.  After trying to resolve some of my issues (that you have now expertly repaired) i stumbled upon The ADS-B Receiver Project, but it's been over a year since the last commit and it's still based on Raspbian Stretch, so I decided to stick with the current PiAware base image and build on top of that.  Thanks again for being so very patient with a neophyte trying to learn a little bit about these great little radios.