I need certain const value to be passed in rawsocket's setSockOptInt proc (http://nim-lang.org/docs/rawsockets.html#setSockOptInt,SocketHandle,int,int,int). The problem is, it varies from OS to OS, even depends on cpu archs. Since those options are not implemented in nim, i'll have to find them by myself. Which makes me to wonder, what is the approach in these cases? Where can one get these values?