Product: Fedora https://bugzilla.redhat.com/show_bug.cgi?id=803812
--- Comment #2 from Jens Petersen petersen@redhat.com --- Looking again at the build error it seems like gtk2hs-buildtools (c2hs) is generating broken type signatures for those functions (Bool does not take a type variable).
Still no idea why, but it might be a gtk2hs-buildtools bug I suspect.