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https://bugzilla.redhat.com/show_bug.cgi?id=522821
--- Comment #4 from Yaakov Nemoy loupgaroublond@gmail.com 2009-09-12 13:53:00 EDT --- It's a haskell package, and ghc is not included by default in Fedora (yet). It's so fundamental to all haskell packages that a little redundancy won't hurt. Especially considering that the gtk BR could go away.
In some cases, it's also necessary to specify a particular version of GHC, which the gtk package might not do.