this derivation will be built:
  /nix/store/ki4yqfjwabfdnpdjahznwzlmnhdjmklk-keen4.drv
these 3 paths will be fetched (1.4 MiB download, 3.8 MiB unpacked):
  /nix/store/jn25qb9r1vjdrydq082dbr5xham2zm26-SDL_compat-1.2.60
  /nix/store/5xqcz9siipi7p8rl5b3kzfgb2myyby30-dosbox-0.74-3
  /nix/store/m6k8r0y82g6iclv2m08c9cax0vlkr748-keen4.zip