these 21 derivations will be built:
  /nix/store/knn4w1wfwlf4a3d6051ywr28y02gvr3s-chain-1-root.drv
  /nix/store/7ifvs0lak54d03rz8ch78bhv4azjd0jj-chain-1-link-1.drv
  /nix/store/bs8bpfsqqcp1xp3f3fcgw1clpisy3inp-chain-1-link-2.drv
  /nix/store/kshb8ca7fvp7jnjgpbpms8b52mrgq0lg-chain-1-link-3.drv
  /nix/store/ldihqaipxrxnmygrbgl7vf8bjwdvqpgv-chain-1-link-4.drv
  /nix/store/ni5cj0njvzrrdd0cbl060d5sn26kqbqn-chain-1-link-5.drv
  /nix/store/sjw612xnb3czv857hva13ldyhbnh0mvn-chain-1-link-6.drv
  /nix/store/7y4s98vj0is1jjakc16dbq82ca3rk6px-chain-1-link-7.drv
  /nix/store/hv49zbixjrryyfcqk266bal1a6wsxyvd-chain-1-link-8.drv
  /nix/store/161j9b89wl6d8n12jw443rv6fszkpvng-chain-1-link-9.drv
  /nix/store/qr1143dk8d6cm54qsqwwgfh6vqnlix37-chain-1-link-10.drv
  /nix/store/mb5l4js2f63f5z4cym5z2rfik83s7j6a-chain-1-link-11.drv
  /nix/store/b31mpmyaj9iyhpw8vfnw3mwrs85axgqc-chain-1-link-12.drv
  /nix/store/dpypkn08rdwcaqjl0lykfp3ad2nmh0g9-chain-1-link-13.drv
  /nix/store/li4xjkaqpsgssms3vi3k3whnl0z3b1rv-chain-1-link-14.drv
  /nix/store/kjcb8rfwhcz8qb197zfqmdppy6v6xkzw-chain-1-link-15.drv
  /nix/store/slb0md0c65z18k12j5r50ckmah7sjd3v-chain-1-link-16.drv
  /nix/store/kkyx7ay7b9y5381fjwjdwlqqfryddi4h-chain-1-link-17.drv
  /nix/store/2rq9h4vkvw5w9wxhyzxd3qnlqwdzkz29-chain-1-link-18.drv
  /nix/store/qq8915mgps55306mphrj3j5ly704h4ri-chain-1-link-19.drv
  /nix/store/7hsnzx380p78icklhlz20q8sw4a3l8g0-chain-1-link-20.drv