these 4 derivations will be built:
  /nix/store/aihniw405c7hzhqg7yqbwlr3dvd5mzw3-ctx-1.6.3-vendor-staging.drv
  /nix/store/wn0jkb3yblqj9cylw30nadnfqlc62w9p-ctx-1.6.3-vendor.drv
  /nix/store/pmk33jpcqs4bvyfcdf0rc6nkr66lskir-ctx-1.6.3.drv
  /nix/store/g511vl3pfy57vm3kjvr71ydlaw699q1h-check-ctx.drv