these 21 derivations will be built:
  /nix/store/r5vvvjbly8zswaj4dsf9wl61cpp2yfkl-chain-1-root.drv
  /nix/store/yvxaiqrr8p9qi856ip3wq7j6dqm20ld2-chain-1-link-1.drv
  /nix/store/r3xx5q80w6xirdv9mxhh3ri1jjva6519-chain-1-link-2.drv
  /nix/store/58w861rfcsfxcgrsm28qrpfkhq6adb1k-chain-1-link-3.drv
  /nix/store/7p59i8dpkxsawi2bv5dz34psxfgxr0qk-chain-1-link-4.drv
  /nix/store/s7zck63k1p9hisl6shb7nwygyk0n8lzg-chain-1-link-5.drv
  /nix/store/kj96falnl1zqhbb25il626wdsanqjshj-chain-1-link-6.drv
  /nix/store/3rvap59wfgr7yr4yfcznfwcdslbzvkk6-chain-1-link-7.drv
  /nix/store/7n6f1qhcb5nj9il74cxiqag9cwih8ai9-chain-1-link-8.drv
  /nix/store/4mb62babbx8h35lb8mj8mv8nn72wkalc-chain-1-link-9.drv
  /nix/store/sic952fbi6i9hpnrsy6iazjzvyzl6md0-chain-1-link-10.drv
  /nix/store/hbz7r58nd854zyxsldgm5axnkmcvw216-chain-1-link-11.drv
  /nix/store/12ncg9f33fksy67dd5ijifs827qq97yg-chain-1-link-12.drv
  /nix/store/5kff62hcz6zs9q6qsgxrmypryd367cv0-chain-1-link-13.drv
  /nix/store/v8ybxs0wp7c0vn3n3i3r1xh71xc1qz8a-chain-1-link-14.drv
  /nix/store/33gz20axiy0fnbsvcri7wlfnz864xlax-chain-1-link-15.drv
  /nix/store/jwbakknmqip3z5p88ndwhv002cc9hwby-chain-1-link-16.drv
  /nix/store/qm4ddik8dzpxdmjgvi2h3myplwm8wbgd-chain-1-link-17.drv
  /nix/store/0vmj8j0l8acfzib4qkwfpqb7vw9x55p8-chain-1-link-18.drv
  /nix/store/kgab9lsdz546bhjc5d7ndxy75jiklyq3-chain-1-link-19.drv
  /nix/store/m6zn4qm75p29rfkfg0c5ss9n0z4dqzsg-chain-1-link-20.drv