these 3 derivations will be built:
  /nix/store/c65vhz000vrln0w95s8jqkib4h14zgw3-pi-src-with-lock.drv
  /nix/store/3yd77qxn0zlfd0g2xq0bdmrwf4ys9qdr-pi-0.99.1.drv
  /nix/store/ma2rlmg9fz5jym35n7dn225x16bvd3s5-check-pi.drv