Blame win32/VS2010/README

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libvorbis has libogg as a dependency, you need to have libogg
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compiled beforehand.
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Lets say you have libogg and libvorbis in the same directory:
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libogg-1.1.3 
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libvorbis-1.2.0
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Because there is no automatic library detection you have to,
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either:
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1. Rename libogg-1.1.3 to libogg
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2. Open libogg.props with a text editor (even notepad.exe
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will suffice) and see if LIBOGG_VERSION is set to the correct
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version, in this case "1.1.3"