libvorbis has libogg as a dependency, you need to have libogg
compiled beforehand.

Lets say you have libogg and libvorbis in the same directory:

libogg-1.3.2 
libvorbis-1.4.0

Because there is no automatic library detection you have to,
either:

1. Rename libogg-1.3.2 to libogg.

2. Open libogg.props with a text editor (even notepad.exe
will suffice) and see if LIBOGG_VERSION is set to the correct
version, in this case "1.3.2".
