Alexandre,
Patrik brought up the header location sometime ago, in this thread: http://www.winehq.com/hypermail/wine-devel/2002/10/index.html#540
At the time, I thought it is a bit premature, that we have other things to do. Now I realize that this is one of those highly visible external things, that would be a _lot_ better to fix before people start using Winelib. Otherwise will piss people off when we change, or we will not change because people are already using the headers.
Both versions are not good, and I think we can fix them now without too much pain.
Here is my proposal: ${prefix}/include/win32 -- standard Win32 headers ${prefix}/include/msvcrt -- MS Visual C Runtime library ${prefix}/include/wine -- Wine specific headers
It is simple (to understand & implement), clean, and pretty. And I think it solved Patrik's problem (even if I can't quite understand what the problem is from the first message :)), plus a bunch of other things (like making it easy to use other headers for the Win32 API, etc). And best of all, it seems to be easily implementable, no?