these 3 derivations will be built:
  /nix/store/yk9g3z1lq49qj1yi3z89vwkyhml1m5jv-freebuff-linux-x64.tar.gz.drv
  /nix/store/6j2c1pd3mn9135ycsdhd010365lx8ww6-freebuff-0.0.201.drv
  /nix/store/ar0xv5fdyiz2jg5v30b9icy91q4z45vi-check-freebuff.drv