Created attachment 197547 [details]
ONLY_FOR_ARCHS_REASON says that SSE2 or AltiVec is necessary, but powerpc64 supports AltiVec just fine.
Tested to build on powerpc64.
Hardware sponsored by IntegriCloud.
A commit references this bug:
Date: Thu Sep 27 23:02:56 UTC 2018
New revision: 480834
Allow building on powerpc64.
Submitted by: Piotr Kubaj
Approved by: portmgr (tier-2 blanket)