For the repl, can you try "circa_d -repl" (one dash instead of two)?

There is definitely some breakages in there, and most of those samples won't run currently. I'm rewriting the app that runs things in a graphical shell and I hope to have that ready soon. If you are feeling brave, you can go back in time to use Plastic (the SDL-based shell that I was relying on for a while). Instructions for that:

Checkout revision efb5300

Delete the files at src/generated/*.cpp and run prebuild.py again

scons build/plas_r (this will require SDL)

Launch with: build/plas_r samples/asteroids.ca (or some other sample)