Haskell cabal-install >= 3.0 is not supported, so GHC 8.8.1 is not yet supported about cloudi

[okeuday]

https://www.haskell.org/cabal/users-guide/nix-local-build.html#local-versus-external-packages has information that may or may not be implemented

[okeuday]

The cabal-install legacy (v1) commands will be used until more information is available about v2 command usage from filesystem dependencies (to replicate the v1 sandbox usage without a v2 sandbox command). Tested with GHC 8.8.1.

[okeuday]

https://wiki.haskell.org/Cabal/NewBuild was the main link provided in the cabal-install warning output and that provides the link https://cabal.readthedocs.io/en/latest/nix-local-build-overview.html with the disclaimer "Some features described in this manual are not implemented. If you need them, please give us a shout and we’ll prioritize accordingly.".

https://cabal.readthedocs.io/en/latest/nix-local-build.html#specifying-the-local-packages is likely the filesystem dependency use (only packages in a cabal file, no command-line arg requested in haskell/cabal#3585).