these 21 derivations will be built:
  /nix/store/zjm3bxvx4hcsjr7w70m8vshxrxgdjski-chain-1-root.drv
  /nix/store/f6gflbay0gj87xx2wblgh26gngjicbd1-chain-1-link-1.drv
  /nix/store/86hzx8kcn5jlalfj2nxj37gx3zvppqw0-chain-1-link-2.drv
  /nix/store/3f22q1py1b402ksdhjhsivbx96ndprl6-chain-1-link-3.drv
  /nix/store/5s35z53zir4ybwhli2n6dhc9jj0cf0wv-chain-1-link-4.drv
  /nix/store/vqja9zmzyv4qc0p8mwrz137s7g5vi253-chain-1-link-5.drv
  /nix/store/cw0hdb68xbpf8jz31ir7c6g00mwgjxd4-chain-1-link-6.drv
  /nix/store/sfpzkrjy3si7fighq2fzdl1by9msvmyc-chain-1-link-7.drv
  /nix/store/c95clayb1jbsgc2aa6w9j2sazlyc4vhp-chain-1-link-8.drv
  /nix/store/z1jm00wnvw7rfbyqasy2lmf5imyxhfy3-chain-1-link-9.drv
  /nix/store/lh8w48h4c4zdaibm988bkhcfcq4nplfh-chain-1-link-10.drv
  /nix/store/9c4qa94yni2ghaykcrw8v6s09axipd54-chain-1-link-11.drv
  /nix/store/w6sy8lfa8r6zicvzpc4ax5ndh6xzvf7a-chain-1-link-12.drv
  /nix/store/sbm0bvnins7wpss25c0c7xm9ccrmx3ax-chain-1-link-13.drv
  /nix/store/zv5d6xynd37892yim0r2bm97bwckxrix-chain-1-link-14.drv
  /nix/store/fif5cb6rlx0zmv5vmgvxzdq06xbds3f9-chain-1-link-15.drv
  /nix/store/lv9b5knnsf7zxslrg72f9a096xqbf6ap-chain-1-link-16.drv
  /nix/store/brlnmvvbwmrxq357wfwbvgmlx205hhhz-chain-1-link-17.drv
  /nix/store/jhgc25qf5lfr6wm84sz87xw7rhlpn454-chain-1-link-18.drv
  /nix/store/6slwbr4w0rwh8agnbf359qib4i2cm0ca-chain-1-link-19.drv
  /nix/store/lfhcnxv1jw6h181b76zq4dqk2sxry00h-chain-1-link-20.drv