Build nvi 2.1.3 on Mac, missing build instructions

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Hi,

I have tried build nvi from FreeBSD sources directly on my Mac. And I got the nvi binary finally :-)

Basic steps are below:

1. Install required dependency libs(bsdmake and ncurses)

	$ brew install bsdmake
	$ brew install ncurses

2. Checkout the sources from FreeBSD svn repo

	$ svn co https://svn.freebsd.org/base/releng/10.3/usr.bin/vi <https://svn.freebsd.org/base/releng/10.3/usr.bin/vi>
	$ cd vi/
	$ svn co https://svn.freebsd.org/base/releng/10.3/contrib/nvi <https://svn.freebsd.org/base/releng/10.3/contrib/nvi>
	$ cp /usr/include/db.h ./
	$ mkdir contrib
	$ mv nvi contrib/

3. Make some changes, there is a diff file available via below link

	http://by.meetlost.com/diffs/port_nvi_to_macOS.diff.txt <http://by.meetlost.com/diffs/port_nvi_to_macOS.diff.txt>


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