these 3 derivations will be built:
  /nix/store/hfhpx58hz95s5q5rfx34jihlrry4sb9q-freebuff-linux-x64.tar.gz.drv
  /nix/store/scmd1g4fllslznx267lccyr3g5xpm5w5-freebuff-0.2.16.drv
  /nix/store/lm4vg4z99cibiaaar5kf78852w5rjn2j-check-freebuff.drv