this derivation will be built:
  /nix/store/947n16hyfs9j5r0iaakhy201a3a0r1hd-fence-0.1.67.drv
this path will be fetched (4.3 MiB download, 14.8 MiB unpacked):
  /nix/store/qikfg0vlfc5dqk962gaja69mhaidy71i-bpftrace-0.27.0