Error building vorbis_dynamic

Hi,
i'm trying to build the vorbis_dynamic project and i get the error
vorbis.def : error LNK2001: unresolved external symbol _analysis_output_always

Anyone any idea what could be the causing this?
Platform is Windows7 and VS2008ExpressEd.

Help is greatly appreciated!

can't anyone help me with this one?
i'm trying to build the example from the book C++: How to program 6/e.

also OT: do i need a Dx9 capable videocard in order to run the sample programs provided with ogre3d?
i have a Radeon 9000, ie. a Dx8 card.

Still it seems somewhat odd that all the demos would rely on Dx9...

This is the wrong forum for these issues. I do not know much about building the vorbis libs. I would suggest you perhaps not use a beta operating system? That may be an issue. Libraries won't be adjusted to compile on these sorts of development platforms until they... well... "out", and therefore no longer in development.