Possibly NNCP package already exists for your distribution:
@itemize
+@item @url{https://www.freshports.org/net/nncp/, FreeBSD ports}
@item @url{https://github.com/voidlinux/void-packages/blob/master/srcpkgs/nncp/template, Void Linux}
-@item @url{https://git.cypherpunks.ru/cgit.cgi/nncp.git/tree/ports/nncp, FreeBSD currently uncommitted port}
@end itemize
NNCP should run on any POSIX-compatible operating system.