Build nvi 2.1.3 on Mac, missing build instructions

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> among those, only nvi2 is using CMake as
> its build system, so if you just want to build it
> by yourself,
> 
>  https://github.com/lichray/nvi2/wiki/Porting <https://github.com/lichray/nvi2/wiki/Porting>
> 
> is a good starting point.  FreeBSD base
Yes, it is.
> commits generated headers to usr.bin/vi
> which may not fit your needs (on Mac).
> 
Ha, thank you for mentioning usr.bin/vi, I found a Makefile there, and I will look into this also.

Port the FreeBSD Makefile to Mac or via CMake.
I will go with the simple one :-)

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