CommandLine DependencyResolver Build, test, run, and generate Folder 1 Generator "Makefiles" BuildGenerators BuildCache Compiler Target Package Management Folder 2 PackageManager Fetched Packages (~/.dub/packages) Local Packages (dub add-local) Package Overrides (dub add-override) PackageSupplier Package, source code, and repository Folder 3 Package PackageRecipe Dependency Version