Same issue as bug #229336, only this time for port www/nginx-devel.
Created attachment 198338 [details] patch-Makefile Could you try next patch.
Almost. Just change please STREAM_SSL_PREREAD_ON to STREAM_SSL_PREREAD_CONFIGURE_ON and it should work.
A commit references this bug: Author: osa Date: Sun Oct 21 17:49:22 UTC 2018 New revision: 482715 URL: https://svnweb.freebsd.org/changeset/ports/482715 Log: Fix the build issue with STREAM_SSL_PREREAD knob. Bump PORTREVISION. PR: 232361 Changes: head/www/nginx-devel/Makefile
The issue has been fixed, thanks for the report!
Great, thanks for the fix!