Stupid Linux-on-FreeBSD question

For over twenty years, I've been able to avoid Linux pollution of my
FreeBSD systems, but the recent availability of Widevine DRM support
in Chromium caught my attention, and it looks like resistance may
possibly be futile.  But in attempting to compile ports like
www/foreign-cdm and emulators/linux_base-c7, I get the impression that
I should have set linux_enable in my /etc/rc.conf even to compile them,
let alone run them.  Is that correct?

(A little more context: Yes, I am trying to avoid having a dedicated
Linux USB drive to be able to stream Widevine content.)      -- George