I managed to get the Carp compiler built on NetBSD, and then I was able to use it to compile some graphical apps written in Carp. I posted a screenshot to Mastodon: https://bsd.network/@dressupgeekout/105471962632588169
Requires updating a Haskell package or two, and there's still some code which ought to be merged in upstream... But it definitely works as long as you don't turn on SDL's "render vsync" hint (for some reason)
Just in case you wanted a fun, easy way to make games in a Lispy language on NetBSD, now you can!
