these 4 derivations will be built:
  /nix/store/xf7mlki3wnacwis2d0y4ir7cdf4lbsh4-source.drv
  /nix/store/qqk8rs1ys2dw9h7xzi12xg1hwsi62l6p-mercat-0.3.5-zig-deps.drv
  /nix/store/05nx9fvcb2cr5lwg62k8qf6dpvr8gzfi-mercat-0.3.5.drv
  /nix/store/m4v6hk88qr99vmcssx7b5lj375fz3p3a-check-mercat.drv