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Comment by tome | Hacker News Reader

The instructions say install GHC 8.10.7.

https://github.com/simplex-chat/simplex-chat/blob/stable/doc...

I suggest running

    ghcup install ghc 8.10.7
    ghcup set ghc 8.10.7

and trying again.

I don't know what android-support is, but from the error message it looks like it doesn't work with GHC 9.x.

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Thanks for the hints, I did read the instructions at the URL I mentioned, but had assumed that GHC 9 would be backwards compatible with GHC 8. I have no experience with Haskell.

That's a reasonable assumption. It's a bit more complicated than being "backwards compatible". The android-support package needs to say explicitly that it is compatible with GHC 9.x, but it doesn't, so cabal refuses to try to build it.

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