{ pkgs, ... }:
let
  inherit (pkgs) crystal libffi;
in
crystal.overrideAttrs (oldAttrs:
  {
    makeFlags = oldAttrs.makeFlags ++ [
      "interpreter=1"
    ];
    buildInputs = oldAttrs.buildInputs ++ [
      libffi
    ];
    FLAGS = ["--single-module"];
    doCheck = false;
  }
)