these 4 derivations will be built:
  /nix/store/r2y563mvj2fgkrsh5pb7s3yfv5n442az-source.drv
  /nix/store/gmg6czskqikgql94d64i3ayvn5qjh26s-ctx-1.2.1-vendor-staging.drv
  /nix/store/g359ifncwigyk4ymi839vjyji29zgkwm-ctx-1.2.1-vendor.drv
  /nix/store/3lyvn9415v7ww86j40kh8za7hsj8n736-ctx-1.2.1.drv