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Bug #798880 (enable WebM on Firefox) requires new system libvpx (1.0.0) but the recent RHEL6 package is 0.9.0.
This request was evaluated by Red Hat Product Management for inclusion in the current release of Red Hat Enterprise Linux. Because the affected component is not scheduled to be updated in the current release, Red Hat is unfortunately unable to address this request at this time. It has been proposed for the next release. If you would like it considered as an exception in the current release, please ask your support representative.
We managed to build it w/o system libvpx plus there's a problem with old yasm version. Closing as WONTFIX.