How to check for haskell package versions in ./configure?

Question

how can I tell configure to check for version >= x.y of a given Haskell package?

Thanks,

Answer 1

Use cabalvchk: http://hackage.haskell.org/package/cabalvchk-0.2

For example, to verify that the version of parsec is >= 0.4, you could issue:

$ cabalvchk parsec '>= 0.4'

The return code will be zero if the version constraint is satisfied and non-zero otherwise. The version constraint can be anything cabal understands. An optional third parameter can be non-blank to request verbose output.