Okay, I misunderstood the stack. It's clearly not using any mono stuff, so `sudo apt install libgc-dev` fixed the situation and I can move forward.
Final list deplist to install #gnupoke on #ubuntu for me was:
`sudo apt install tcl-dev libgc-dev libjson-c-dev libreadline-dev`.
Now we `make`... GNU software is so 80s, omg. :3
OK, it didn't work because default prefix is LFS, let's do `configure --prefix="$(pwd)"`.
`cat Makefile | grep prefix` shows `prefix = /home/sweater/gnu/poke-1.0/build`...
Okay, local install succeeded: