I went the extra mile over the weekend and updated F15 to haskell-platform-2011.2! It is now in the updates-testing repo: https://admin.fedoraproject.org/updates/haskell-platform-2011.2.0.0-1.fc15 (100 src packages) and should be in the final release which is due at the end of May. :) Cheers, Jens