these 3 derivations will be built:
  /nix/store/xb2zka8q92glb85zqqs26yl316c8kf3z-source.drv
  /nix/store/cvvpig398hyfhlb88skff6kc4fi0l1ws-gno-2.8.0.drv
  /nix/store/5kn1vig0qcqm37jxf2h5pnivp66xkgh0-check-gno.drv