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I'm not sure what the slashpackage hierarchy is, but Nix & NixOS started in 2003.

• lifthrasiir 6y ago
  That's https://cr.yp.to/slashpackage.html https://cr.yp.to/slashpackage.html which is dated at least 2001. It's not quite the same to the Nix approach though, which also tracks all direct and transitive dependencies.