'Twas brillig, and the slithy toves did gyre and gimble in the wabe

Building from source tends to work a lot better on Linux boxen, mainly because the developers tend to be working in said system and understand it well. The result is something that simply flies along in situations where everything is set up as expected, and falls over messily otherwise, as you have seen.

In order to build windows binaries, the developers would first need a Windows-based PC, which cannot necessarily be assumed. In summary, I suggest that their Windows maintainer (whose responsibility it is to package the software for use on Windows machines, as you're probably aware) is on crack and should be shot.

Problem 6 is ... interesting. Could be an honest typo, but /might/ also be triggered by your solution to problem 5.

Conclusion: Not impressed by the Ogg Vorbis Windows maintainer. Building binaries shouldn't be that hard, but the problems you've encountered (particularly with MSVC projects) are unacceptable. Someone isn't doing their job and, since they're not being paid to do so, it's kinda hard to make them. If it helps any, this annoys me too.