Hello Walter,
I kind of like the idea that it shouldn't install D packages, but rather cache them from the web repository.
One absolute must in my book is that it be trivial to get a build working without any external dependencies. Tweaking lots of import paths is not trivial. Some users won't use a system that isn't set up for that. Two things that come to mind are 1) a mandate that "everything needed to build must be checked into source control" and 2) a project where the owner, for security reasons, wanted to be sure that all external dependencies (compiler, libs, etc.) predated the code that depended on them.
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