[Haskell-beginners] can't install hackage package

[Emmanuel Touzery]

Hello,

 I've been using this hackage package "rex" without problems on two
computers (linux, windows) but now I fail setting it up on a third computer
which confuses me, and the error message is not really enlightening for me:

$ cabal update
Downloading the latest package list from hackage.haskell.org
$ cabal --version
cabal-install version 1.16.0.2
using version 1.16.0.3 of the Cabal library
 $ cabal install rex
Resolving dependencies...
cabal: Could not resolve dependencies:
trying: rex-0.3.1

Any idea?

Thank you!

Emmanuel
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