See https://reviews.freebsd.org/D10015
A commit references this bug: Author: amdmi3 Date: Wed Mar 29 13:35:46 UTC 2017 New revision: 437200 URL: https://svnweb.freebsd.org/changeset/ports/437200 Log: - Remove useless warning HTTPS-only is normal novadays, also may@ says that the warning was there because before 8.4 libfetch did not support going through a proxy for HTTPS PR: 217995 Approved by: maintainer timeout (marcus, 2 weeks) Differential Revision: D10015 Changes: head/ports-mgmt/portlint/src/portlint.pl
This has been fixed in 2.17.7.