these 3 derivations will be built:
  /nix/store/adm4wcw97vg2vira7gcm0flnk9alh33s-ck-0.8.1-vendor.drv
  /nix/store/8b0i5h668hbzhx91g10y7i7v8f2aw3h5-ck-0.8.1.drv
  /nix/store/8g49yh9g6vbdc6rdb742i4glvn12273n-check-ck.drv