these 4 derivations will be built:
  /nix/store/8z9ifsf0h0rsjm3fd37alfh02qlw8lzp-source.drv
  /nix/store/6vrjrf267fhl7md3nyqx63yrmzy355ax-ctx-1.2.3-vendor-staging.drv
  /nix/store/3qbnvfr5l5rs3qlzndasycw552y4adgl-ctx-1.2.3-vendor.drv
  /nix/store/2pjkwgy410kc90nha6pb0lkd9lm93hjw-ctx-1.2.3.drv