these 3 derivations will be built:
  /nix/store/1hl4nm8pjgwib30fnr1q7i26v9lcs65i-freebuff-linux-x64.tar.gz.drv
  /nix/store/dmfcc9iq3cgran4hpf4sk6kg82pwyv90-freebuff-0.1.4.drv
  /nix/store/7dk8pwdsr8hv3binaj3i2r8a9y3cp68p-check-freebuff.drv