The folks at MKVToolNix have officially merged the changes submitted by DivX to add HEVC support to MKVToolNix. The latest version of MKVToolNix (v6.8) includes these changes.
No more custom builds and playing with custom binaries, download the official MKVToolNix binaries/installers (v6.8 or later) and mux/demux HEVC video to/from mkv container to your hearts content.
MKVToolNix is a popular set of open source tools used to mux and demux Matroska (mkv) files. The tools used to support AVC, VP8, VC1, and now, with the DivX team's latest contribution -- HEVC!
All set? Now head over to the HEVC Documentation section to learn about Using MKVToolNix to mux your first DivX HEVC video. And while you're at it, don't forget to review the DivX HEVC profiles. As always, we welcome your feedback.