[tikhonj]

I've thought the same for a while, and now I'm looking to Nix[1] as a solution. Upside: strong fundamental design, extreme reproducibility, great Haskell support. Downside: small community, middling OS X support, essentially non-existent Windows support.

It's still squarely in early adopter territory and the documentation is woeful, but if you're willing to put up with that it really does feel like the "one true package manager" I've been searching for. I've been using it at work and while the setup was painful and some things are still awkward (ie statically linking Haskell executables), it's been incredible overall. The up-front work in learning the system and getting it running has paid off already, and it'll pay off even more as I continue using Nix for other things.

[1]: https://nixos.org/nix/