Description of problem:
I try to update my system with "dnf update" and it return:

Traceback (most recent call last):
  File "/bin/dnf", line 35, in <module>
    main.user_main(sys.argv[1:], exit_code=True)
  File "/usr/lib/python2.7/site-packages/dnf/cli/main.py", line 277, in user_main
    errcode = main(args)
  File "/usr/lib/python2.7/site-packages/dnf/cli/main.py", line 64, in main
    return _main(base, args)
  File "/usr/lib/python2.7/site-packages/dnf/cli/main.py", line 133, in _main
    result, resultmsgs = cli.run()
  File "/usr/lib/python2.7/site-packages/dnf/cli/cli.py", line 1360, in run
    load_available_repos=lar)
  File "/usr/lib/python2.7/site-packages/dnf/base.py", line 223, in activate_sack
    self._add_repo_to_sack(r.id)
  File "/usr/lib/python2.7/site-packages/dnf/base.py", line 133, in _add_repo_to_sack
    repo.load()
  File "/usr/lib/python2.7/site-packages/dnf/repo.py", line 411, in load
    if self._try_revive():
  File "/usr/lib/python2.7/site-packages/dnf/repo.py", line 287, in _try_revive
    handle = self._handle_new_remote(tmpdir)
  File "/usr/lib/python2.7/site-packages/dnf/repo.py", line 207, in _handle_new_remote
    h.setopt(librepo.LRO_FASTESTMIRRORCACHE,
AttributeError: 'module' object has no attribute 'LRO_FASTESTMIRRORCACHE'

Version-Release number of selected component (if applicable):
I'm on Fedora 20 alpha, i686 release, with dnf 0.4.6

How reproducible:
Type "dnf update"