these 21 derivations will be built:
  /nix/store/fyicyzgmklf4vaf2hpgnks1dy0d36c8y-chain-1-root.drv
  /nix/store/6zhivy16civymf6dv89n4nck9av12npj-chain-1-link-1.drv
  /nix/store/4cn6n5blrbqxpskzplkpkfk61zly0b6v-chain-1-link-2.drv
  /nix/store/hqxknn6xazkl6drzh96d8cvraf1jbb50-chain-1-link-3.drv
  /nix/store/40m3h54spdgm6ycm7qv8wa0d9hz169sz-chain-1-link-4.drv
  /nix/store/zgnlg49sral6blxykq1g3n42hhv5qgqj-chain-1-link-5.drv
  /nix/store/m16fc5fp6x5wjx5crcn3rj3a55vglb0m-chain-1-link-6.drv
  /nix/store/gf6i8di7rjg9niw1qj1azxdvgq9vayvh-chain-1-link-7.drv
  /nix/store/y12v5rqb0y2gspwz2vnqdnhp3yz70m8d-chain-1-link-8.drv
  /nix/store/0awbnqq5s46x69qggys4wipawqjl7026-chain-1-link-9.drv
  /nix/store/kjpg5jgzs3rb7pkx1iir7fgqsx5gaqlb-chain-1-link-10.drv
  /nix/store/mm7jh6w47hgpck20nf6k5mwm32snwk6z-chain-1-link-11.drv
  /nix/store/yld2vjmrg4bkr7r55i0wwyqvzznzgf25-chain-1-link-12.drv
  /nix/store/z6nrf51vjm1krcw6jy3pk45a9q4xrqk0-chain-1-link-13.drv
  /nix/store/1lqmjf9x5156wwck9ha8gxncrg9zl483-chain-1-link-14.drv
  /nix/store/1xwh2il0yv05jdxmbyqnjhl58xh13m1n-chain-1-link-15.drv
  /nix/store/3v0jg8qrwqpj5v454plpf4wa1j3swnwp-chain-1-link-16.drv
  /nix/store/p2980ji8av2qsg9nra0ipf84q61aiaq7-chain-1-link-17.drv
  /nix/store/382bd8qds9gbk0w5kjdvqm998mbxlnj4-chain-1-link-18.drv
  /nix/store/prv9xjmk8mmgq7gmf40nd67ahw3x71q4-chain-1-link-19.drv
  /nix/store/rqrkl0qiizy2bv6z441md5pzhczil28q-chain-1-link-20.drv