I would like to, but from my experience thus far of writing a C library and using some C99'isms, then doing a bunch of work to port it to Windows: Windows developers are not satisfied with something working on Windows, they want to be able to compile it in Visual Studio or they won't use it. Don't know how generalisable this is, but all I know is that I'm forced to go back and remove any C99 from my code if I want my library to be used on Windows, despite the fact that the binaries I distribute work fine.

Well, I can't blame them for wanting to use their tools of choice, but as a developer wanting his work to be compatible with the most popular platform, it's an unfortunate situation.