Most of the instructions is outlined on FreeBSD wiki at:

	http://wiki.freebsd.org/SubversionPrimer/VendorImports

nc(1) is very small and most of code are just copied as-is from OpenBSD.  With a
few exceptions:

 * --no-tcpopt: Local feature specific to FreeBSD.
 * -V: We use FIB to map what OpenBSD do for "rdomain"
 * -E, -e: These are mostly self contained IPsec extensions

delphij@FreeBSD.org - Mar 23, 2010