https://bugzilla.redhat.com/show_bug.cgi?id=973512
--- Comment #11 from Jens Petersen petersen@redhat.com ---
http://koji.fedoraproject.org/koji/taskinfo?taskID=6467138 This f21 scratch build should also work fine on F20.
I forgot I only built it so far for i686. Anyway I will build soon for rawhide and then it should be easier to test.
As noted earlier, the ghc lib's ABI hash changes so unfortunately this also requires some rebuilds to push cleanly.