these 3 derivations will be built:
  /nix/store/kprnq8cdawbfyf341l59vd1w18cicf9w-freebuff-linux-x64.tar.gz.drv
  /nix/store/b7rvpw1s3c9acgvja67j5iawb8yps283-freebuff-0.2.12.drv
  /nix/store/55i1r68s17hh8v52ag4315x22fkzfihl-check-freebuff.drv