With cabal-install >= 3.12, we need to adjust our cabal-install overlay
once again.
- Due to the new dependency semaphore-compat, which appears to require
unix >= 2.8 it is very difficult to get to work for GHC < 9.6 (but
probably possible). Technically, using pkgs.cabal-install should
always be fine, so there's no strict need for cabal-install to work
with every GHC. Let's drop support for GHC < 9.6 for now.
- Make sure that cabal-install-solver also uses the latest version
always.
- Due to Cabal 3.12, we need to deviate from Stackage for
hackage-security. cabal-install does support the standard version of
resolv now, though.