Hi, I did a test build [1] of the current ghc-7.8 branch for Fedora 21 devel,which I think should also install to Fedora 20.
I put the packages for x86_64, i386 and armv7hl into the yum repos under
I haven't tested this latest build yet but wanted to announce its availability.
Let me know if you hit any packaging problems with it.
Jens
ps I also upload the ghc-7.8.0.20140201 src tarball to
to build yourself.
which creates yum repos for one (like OBS).