Possibly a stupid question, but I can't figure this out and searching made me more dumb...

I would like to install knockd. It's available through ipkg, but I don't want it to dependent on external storage devices. I would like to use knockd all the time. So how do I install knockd on the ASUS?
Is it possible to just copy the binary from ipkg to the flash or do I have to compile it myself. And if I have to compile do I need to compile the whole Oleg distribution?