fyi: compiles/works fine one OS X

[JayBrown]

10.11.2… needs GNU automake etc., of course, but that's easily installed with homebrew.

But is it correct that IPgen only outputs a list of all local IPs without any additional information?

[royhills]

ipgen outputs a list of ip addresses for the given network specification. They don't have to be "local", and ipgen doesn't know anything about your network configuration.