Flint2 provides a thin Haskell wrapper for Flint C-library.
Install the C-library available from Flint. There are packages available for various operating systems.
Install the Haskell interface with
cabal install Flint2 --lib
The depencies are minimal. Flint2 relies on just three libraries: QuickCheck, groups, containers.
A simple example for the application of the library is the factorization of $2^{256}-1$:
import Data.Number.Flint
main = print $ factor (2^256 - 1 :: Fmpz)
runnnig main prints
[(3,1),(5,1),(17,1),(257,1),(641,1),(65537,1),(274177,1),(6700417,1),(67280421310721,1),(59649589127497217,1),(5704689200685129054721,1)]
examples can be found soon in Flint2-Examples