Cannot compile a haskell project using cabal

Question

I'm trying to compile a haskell project using cabal, but when I execute cabal configure appears:

Could not resolve dependencies:
[__0] trying: MM-0.1.0.0 (user goal)
[__1] next goal: base (dependency of MM)
[__1] rejecting: base-4.12.0.0/installed-4.1... (conflict: MM => base>=4.9 &&
<4.10)
[__1] fail (backjumping, conflict set: MM, base)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: MM, base
Trying configure anyway.
Configuring MM-0.1.0.0...
cabal: Encountered missing dependencies:
base ==4.9.*, cassava ==0.5.*, containers ==0.5.*, time ==1.6.*

I tried using cabal new-build and cabal install --only-dependencies but it still doesn´t work.

Joseph Sible-Reinstate Monica · Accepted Answer · 2020-04-19 04:53:59Z

1

The program you're installing needs base 4.9.x.x, which means GHC 8.0.x. Your GHC is too new. Downgrade to 8.0.2, or look for a newer version of the program you're trying to install.

answered Apr 19, 2020 at 4:53

Joseph Sible-Reinstate Monica

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