The latest update of nginx-devel to 1.3.10 also includes support for ModSecurity v3, but the distinfo is missing the required information to fetch the tarball for that plugin.
A commit references this bug: Author: osa Date: Thu Mar 22 23:53:55 UTC 2018 New revision: 465328 URL: https://svnweb.freebsd.org/changeset/ports/465328 Log: Add modsecurity v3 distinfo entries. PR: 226848 Changes: head/www/nginx-devel/distinfo
Committed, thanks!