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I've submitted a patch in the "Patches" tracker, which fixes all HAVAL hashes and makes the test suite pass on Linux/ppc. Could you please see whether it works for you also on MacOS?

Patch here:
https://sourceforge.net/tracker/download.php?group_id=4286&atid=304286&file_id=214181&aid=1650733

Successful "make check" on ppc:
http://buildsys.fedoraproject.org/logs/fedora-development-extras/26829-mhash-0.9.7.1-3/ppc/build.log