how to make ports not install xorg or dependencies

Hello,

context: freebsd-12 r336215 arm64

I don't want xorg or X11 or any of its components installed on this 
system. I install ports in the traditional way, in other words cd port 
&& make config && make install. Any ports that in a generic config want 
to install xorg libs, I want the no-x11 variant.

There used to be a way to enforce this no-xorg in make.conf but looking 
at /usr/share/examples/etc/make.conf I can find no reference to X Xorg 
x11 or xorg. I presume there's a new method. If there is, can anyone 
please tell me how?

thanks,
-- 
J.