Sorry, wasn't talking to you in the 3rd person, I actually quoted the wrong message
I deleted the x16-hello package and cc65... then I noticed a cc65 directory in a higher level directory... I must have installed an earlier version... earlier.
So I reinstalled, but screwed up my PATH variable, and had to reset it to the default. (I typoed PATH$ instead of $PATH)
Then I had to add /snap/bin to my PATH in order to run the emulator.
But, x16-hello-cc65 built just fine, helloc ran just fine.
I switched to x16-demo-master and ran make... and errorred with: ./tools/bas2prg.py ../x16-emulator/x16emu ./release/basic ./release/PRG
converting file ./release/basic/koala.bas...
sh: 1: ../x16/emulator/x16emu: not found
Traceback (most recent call last):
File "./tools/bas2prg.py", line 63, in <module>
FileNotFoundError: [Errno 2] No such file or directory: 'KOALA.PRG.TMP' -> './release/PRG/KOALA.PRG'
I'm guessing that error is related to my screwup of the PATH variable
But thanks for the help, I'm mostly up and running; I can start studying examples and trying to write my own code now, anyway.