these 21 derivations will be built:
  /nix/store/jwp48p9xp7zyvkghw2kshyvmqviyvjxs-chain-1-root.drv
  /nix/store/lznzilbxnpdk5pxnj0n634rvfpxgg842-chain-1-link-1.drv
  /nix/store/z7wxhh0c992iyfv017pvjgi857y847z7-chain-1-link-2.drv
  /nix/store/vx7c3vr4av0ajx4y70pwjkvica5ad96z-chain-1-link-3.drv
  /nix/store/64c10qjklmcy79wm8d45q50gl1kc5ygm-chain-1-link-4.drv
  /nix/store/4qxl43la0cx8rmapx0j97ahagbzh9a7a-chain-1-link-5.drv
  /nix/store/1hx8p4irm47w6hrmpg0sg1xnvvav3208-chain-1-link-6.drv
  /nix/store/3k2j3xs5cvj5g64jj1djypi6cz3248wa-chain-1-link-7.drv
  /nix/store/4ai9b0c696600n0vfg81cv4qqjdb00s3-chain-1-link-8.drv
  /nix/store/ycdr0i7pav1gwblwbnfxd5nwcyv9fmsy-chain-1-link-9.drv
  /nix/store/njcgy9b3iyfh8kn3mkd6xfawic5vc9nb-chain-1-link-10.drv
  /nix/store/iiwj0x668f2nkfpc3s1mb5g9hxm5h84k-chain-1-link-11.drv
  /nix/store/n613b01lj9g44ps4xlmh7mfb4xshsvyk-chain-1-link-12.drv
  /nix/store/y9r1qj68gq4r6xfypq55zsh1ld46rmh6-chain-1-link-13.drv
  /nix/store/rsxddmhvbr79v4ryi5zsgv5fp4s52il0-chain-1-link-14.drv
  /nix/store/8p5va265chchc1w63f7wk4fldqmcz5h2-chain-1-link-15.drv
  /nix/store/ylnkayfdw10axiw5vx4rwjgghmlicd27-chain-1-link-16.drv
  /nix/store/7a2y3w10danhc8pnz980j2q87xfha46g-chain-1-link-17.drv
  /nix/store/2hiz2nmzc049yfhc7p7l0n04bcf2zdza-chain-1-link-18.drv
  /nix/store/nfz3jlzf27ysmp7dqbiiji4bqhnpa3fr-chain-1-link-19.drv
  /nix/store/z0apf1bgr1v9pvzvd7n4yxcx85gqgn1z-chain-1-link-20.drv