these 3 derivations will be built:
  /nix/store/cahgaqz10mgdd188c60yzr3xs56nf88l-pi-src-with-lock.drv
  /nix/store/6rybaxw3i9akn5jpfb9vzgfrmhx5wzh6-pi-1.3.0.drv
  /nix/store/3zh6ffmvgwz1avv2l5cq1bnmgrz2j9k7-check-pi.drv