mtr-0.87 does not build with --disable-ipv6 option. Fixed in upstream: https://github.com/traviscross/mtr/commit/3d1352ca93efca2f8c4be7ccd16cbe2472b4fff0
A commit references this bug: Author: sunpoet Date: Tue Nov 22 18:43:09 UTC 2016 New revision: 426848 URL: https://svnweb.freebsd.org/changeset/ports/426848 Log: - Fix build with IPV6 disabled Obtained from: https://github.com/traviscross/mtr/commit/3d1352ca93efca2f8c4be7ccd16cbe2472b4fff0 PR: 214731 [1] Submitted by: <sergey@akhmatov.ru> [1], Iain Grant <iain.grant@stream-technologies.com> (via email) Changes: head/net/mtr/files/ head/net/mtr/files/patch-net.c
Committed. Thanks!