these 21 derivations will be built:
  /nix/store/pc0pdppagz69yjhws4iq7sfsppjbbjx6-chain-1-root.drv
  /nix/store/2sn80q5siflxjr95gxd4s87nc0i9sl1z-chain-1-link-1.drv
  /nix/store/y9ddg3llhlf5lkzdgygs10jw0vwdg0qb-chain-1-link-2.drv
  /nix/store/wdkbhz6y0bynwfy33lx9yb4dfgsrf6sb-chain-1-link-3.drv
  /nix/store/y161fykm8idm9rsz4ajyr49ckxdrx2ff-chain-1-link-4.drv
  /nix/store/9n2mnzv3pqwlvhjxrg7w11v8j71plprh-chain-1-link-5.drv
  /nix/store/jyd38dkcvb34v9hrfy87dh1lg8n9krg7-chain-1-link-6.drv
  /nix/store/3aav4vq90d1jakmw5y0v0raz7giwrmyz-chain-1-link-7.drv
  /nix/store/m4b6bi14k5vjwjkx74m5634mfz5i3p4w-chain-1-link-8.drv
  /nix/store/k5ci8dmpmp2j2jqraja7dhq1iyksz5iz-chain-1-link-9.drv
  /nix/store/54vw8kwpys7fqfws8lpvsawrb0sd95mq-chain-1-link-10.drv
  /nix/store/am07v0kr0vlhlq2lnccja01ya044xnq8-chain-1-link-11.drv
  /nix/store/1m0q4wq5xk9zh5rm9i1qfxn58z3qc276-chain-1-link-12.drv
  /nix/store/lyd4hg8l73nmc8m3q88sw6w2gh074fs6-chain-1-link-13.drv
  /nix/store/mirxhd3zjbjkylr5praa90q3k6gl8rnm-chain-1-link-14.drv
  /nix/store/0fsx9nb0zc93q7l1zvp4czqvcibhsjy0-chain-1-link-15.drv
  /nix/store/cm8pj53lddbbrjqd0jyx68lzch348lvc-chain-1-link-16.drv
  /nix/store/ammk4m0vdv3r6swwjbz7mjqljhypdc4j-chain-1-link-17.drv
  /nix/store/savrjkl7jw8cj1a4l0qkgjfsr65vy1jc-chain-1-link-18.drv
  /nix/store/sgjjd4fwb6xv30a3xy7a85jmzav81s91-chain-1-link-19.drv
  /nix/store/bxsvcg8sck4j7iak5gndfdi88hs6vs9q-chain-1-link-20.drv