Build nvi 2.1.3 on Mac, missing build instructions

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Hi,

I am trying to use nvi on my Mac, and after I ‘brew install nvi’, I found the version is 1.81.6, not the latest.

I know the version of nvi in freebsd head is 2.1.3 now, so I checkout that, and trying to build it myself.
But I found there is no build/ directory under nvi/, and I know there is a build/ directory with nvi-1.79, and the link is:
https://sites.google.com/a/bostic.com/keithbostic/vi/ <https://sites.google.com/a/bostic.com/keithbostic/vi/>

How can I build the nvi package? It is under base/head/contrib/nvi directory. Maybe any Makefile or build instructions under upper directory?

Thanks
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