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Versions of libarchive since 3.2 optionally support LZ4 archives. This can be enabled by adding BuildRequires: lz4-devel to libarchive.spec.
Thanks for the report! http://pkgs.fedoraproject.org/cgit/rpms/libarchive.git/commit/?id=842bb796cfbb3ed8bfa386407d1e815d885aeb2f