The Haskell packages in Nixpkgs generally are all built with a single version of GHC, with packages pinned to a single Stackage resolver.
We plan on merging this PR to
master in two weeks, on December 22nd, and marking all un-buildable packages as broken. If any of your packages currently are broken on Hydra on
haskell-updates, we’d appreciate PRs fixing them and/or new releases pushed to Hackage. If you need help fixing your packages, feel free to reach out to us on GitHub, Discourse, or Matrix.
This bump has caused quite a lot of (expected) breakage, so we’d appreciate help unbreaking some of these packages!
haskell-updates build reports are a good place to see if any of your maintained packages are not buildable by Hydra: