I did the same thing and that didnt help. I assume when you follow a README you should follow whats in it. Yet just like most open source doc files they assume one thing or another and are not exact.
To go by your notes the doc file DID NOT tell you to make a folder from your ibay did it? It said download TAR then tar -xzf etc....and cd /OPT/ and what do you know.. there's a phpBB2 DIR! This is the problem with "unsupported stuff" lol