Github user jirib commented on the issue:
https://github.com/apache/trafficserver/issues/1307
FYI OpenBSD uses Libressl, a fork of OpenSSL. So I suppose this is caused
by this difference. FreeBSD and also some Linux distros have adopted LibreSSL
so build error could occur even there.
https://www.libressl.org/
https://wiki.freebsd.org/LibreSSL/Ports (info about changes in apps)
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