these 4 derivations will be built:
  /nix/store/pcs6wdy389vn3mlzm12xgrl25s5jwaz3-source.drv
  /nix/store/lvgvb5s10wfamr088q4036h9g9w3wqqz-mercat-0.3.4-zig-deps.drv
  /nix/store/hwzbhpkg9nnhzm4p4xvk57zbd91rpny3-mercat-0.3.4.drv
  /nix/store/kf38h4fli6v65nrh58pld2i27rjknfmk-check-mercat.drv