Custom (including x64 config) VS2008 solution and project files for protobuf. It would appear that the sln fails to build on command-line, but builds just fine when using the IDE. This would seem apply also for vorbis and maybe some other deps too (Ogre deps at least, IIRC). Also do not download VLC binaries if making a 64-bit build.
Exclude VlcPlugin from the 64-bit Tundra build.