There is a newer Version out: 2.10.2: https://docs.couchbase.com/c-sdk/2.10/relnotes-c-sdk.html#2-10-2-november-23-2018 Can you please make a patch? :-)
A commit references this bug: Author: danfe Date: Mon Jun 29 14:41:49 UTC 2020 New revision: 540776 URL: https://svnweb.freebsd.org/changeset/ports/540776 Log: Update to version 2.10.7. PR: 233468 Approved by: maintainer timeout Changes: head/databases/libcouchbase/Makefile head/databases/libcouchbase/distinfo head/databases/libcouchbase/files/patch-src_lcbio_ioutils.cc head/databases/libcouchbase/files/patch-tools_cbc-proxy.cc head/databases/libcouchbase/pkg-plist
Port had been updated to version 2.10.7 with ports r540776.