'How to add ALLOW_UNSUPPORTED_SYSTEM=yes in freebsd?

I don't know how to use freeBSD, I was trying to build zero tier for my pfSense, here's the build link, https://github.com/ChanceM/pfSense-pkg-zerotier

The problem is I don't know how to add ALLOW_UNSUPPORTED_SYSTEM=YES to /etc/make.conf

How can I do that? Thank you!



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