StumpWM

StumpWM (repo) is the window manager I prefer (falling back to i3 and mate, in that order). It's written in CommonLisp.

sbcl: failed to require sb-cltl2

Every time I've seen this, it's a mismatched or unset SBCL_HOME. On NixOS:

environment.variables = {
    SBCL_HOME = "/run/current-system/sw/lib/sbcl";
};