As this was disqualified as a Pebkac problem, you may ask a team member, or compile yourself .
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Mesa-git build correctly but "vainfo" and "vdpauinfo" core dump - #7 by banjo
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Best way to get h264 accelerated again? - #14 by linux-aarhus
For mesa-freeworld you have to search in history for the correspondig pkgbuild for your branch.