these 21 derivations will be built:
  /nix/store/76zjfcb1rl2y5b6bzyx07g9w435h4xkx-chain-1-root.drv
  /nix/store/z86rpsrsvwgp3li0fvz2pmvf6nv01ydw-chain-1-link-1.drv
  /nix/store/21jbrjrjv41fws2f0lrhqm6ygr0dn4b8-chain-1-link-2.drv
  /nix/store/lyb8cl1x1z0dgvidwa021zih1xdak42n-chain-1-link-3.drv
  /nix/store/h5azgk0z9c0d3kckz8l9bc2qlsk32d5n-chain-1-link-4.drv
  /nix/store/qsv8k7sw26ahwv9qvl1q3bg8rcm8g8w9-chain-1-link-5.drv
  /nix/store/l86d0p86m2h24waahc4mjjb79d1kqzp1-chain-1-link-6.drv
  /nix/store/1jg8isnk6ll07nc1jijgpqj5b86ahbaz-chain-1-link-7.drv
  /nix/store/raka4hfsv45flz5gsynj8ym4kpf5464q-chain-1-link-8.drv
  /nix/store/x29y6q102j7ffrl1z6n0lmyc7szmnrrl-chain-1-link-9.drv
  /nix/store/x70zmxar5yca11ikd46z82qf5hkpg18m-chain-1-link-10.drv
  /nix/store/wg9zkprcnqs7q4hp49swjwsyiila7fs1-chain-1-link-11.drv
  /nix/store/r1lh8qkfjzicbi91vx18q5wl0i5rddyg-chain-1-link-12.drv
  /nix/store/ri54i19k26fxr1qkp5bd6pw2vgjwxjjh-chain-1-link-13.drv
  /nix/store/0qdbzmmbfs8pci1ph86nwqnvzwcc249c-chain-1-link-14.drv
  /nix/store/5i7sr4cy0bh05v84hdpmi8zh4fjz6hzl-chain-1-link-15.drv
  /nix/store/93x9qw973lfp3300a4vkc22skr4gd8da-chain-1-link-16.drv
  /nix/store/b5kn4i4pw34zh5j247zara97hggr99hm-chain-1-link-17.drv
  /nix/store/v3s9szcbq4qxnwr6xg40q175m14zbjkb-chain-1-link-18.drv
  /nix/store/012rzc89zdhcjnyak9n3ws75jbjgv0s1-chain-1-link-19.drv
  /nix/store/m3zh2jcmphcqigi8k35pxsp7693r3pzs-chain-1-link-20.drv