these 3 derivations will be built:
  /nix/store/mwzp2wmcy16qs7s0fk83znns8i8wxd5z-freebuff-linux-x64.tar.gz.drv
  /nix/store/kvkgl581094skgqjwdyrilhf7m21zxb1-freebuff-0.0.183.drv
  /nix/store/yvdas9xkj1b22lkqns9cqlxnwwnic5l1-check-freebuff.drv