these 4 derivations will be built:
  /nix/store/48yfyvbpm6j0vz86l3kswq2q40z3p7ih-crate-cc-1.6.0.tar.gz.drv
  /nix/store/v3hhavyh7s54fs3gm7wh8d4a52jvmszw-cc-1.6.0.drv
  /nix/store/dwpsfmnkbk5aiqsbadwpf0kwr76c5yy6-cargo-vendor-dir.drv
  /nix/store/mn71bj7sqyxxs4nfj1c3vzfayhnb6jzr-nix-ld.drv