these 21 derivations will be built:
  /nix/store/6in1jkfahbm0rk74kj3mvvq4gv91bjyf-chain-1-root.drv
  /nix/store/cl1ahkn6jp51141cmwidhd350a00hd3h-chain-1-link-1.drv
  /nix/store/3x2whgsxz2c2sp6pxjnxppr197548a1s-chain-1-link-2.drv
  /nix/store/ggg09jd88h8jmaifllcqh7g57jcjysc6-chain-1-link-3.drv
  /nix/store/wr85c1qvl0ba0yn8shnzzvbrcifyf6g7-chain-1-link-4.drv
  /nix/store/0xxav68mz9h4mirclbb20913bjijw8n1-chain-1-link-5.drv
  /nix/store/wh4gpxdm5hlg6abcsdmz4ffqq01xwz8h-chain-1-link-6.drv
  /nix/store/38cp2q4rwa848vb6a7mbimna1jf79qip-chain-1-link-7.drv
  /nix/store/wirm3qvlf4bz84kxz36xp3f5r3vd0l70-chain-1-link-8.drv
  /nix/store/p2z2v1qsc32g03q509k3r34157878i8z-chain-1-link-9.drv
  /nix/store/8hsgglsz6cygz1sa6f2fwxhafhb4a066-chain-1-link-10.drv
  /nix/store/390s6a5sf3vqlnbb7p4x8wm5nf1i8lcy-chain-1-link-11.drv
  /nix/store/ghfrzvyk7gj11j68rxzhgqvw1bzw7jb1-chain-1-link-12.drv
  /nix/store/hhalpjw9jipidpqj90fqci0c1568p4lz-chain-1-link-13.drv
  /nix/store/x3q4fa94cqhr3zz33qxgcsgjv2sz2szk-chain-1-link-14.drv
  /nix/store/ig62qgbkx8x8inv4qazrzfjkfrz1gwfh-chain-1-link-15.drv
  /nix/store/z5jgv41z7cnai5q1nx4h58j3d79q4av4-chain-1-link-16.drv
  /nix/store/13nxvgrinj0j35qffw3kni4x4f98iyv2-chain-1-link-17.drv
  /nix/store/vfys510zwccl49rx4mziwdxgyhglqyh9-chain-1-link-18.drv
  /nix/store/vasxi2f34hjfqa1v6r6mi8p7iddwygwf-chain-1-link-19.drv
  /nix/store/3snvcc8b8wvgzrss1j1sv9cdl4m0rx3p-chain-1-link-20.drv