Created attachment 204062 [details] patch to be copied into files directory Autoconf fails to check for __nonnull__, as clang does not allow that attribute with functions that have no parameters. With that check failed __nonnull__ will be redefined and the build fails. The error is known and has been fixed in tinc-devel just after the last tag. Using the attached patch makes tint-devel build as intended.
A commit references this bug: Author: dinoex Date: Mon Apr 29 08:03:47 UTC 2019 New revision: 500395 URL: https://svnweb.freebsd.org/changeset/ports/500395 Log: - fix __nonnull__ attribute PR: 237602 Submitted by: pe82.de Changes: head/security/tinc-devel/Makefile head/security/tinc-devel/files/patch-configure