Every "recent" version of Win32 (that is, Windows 98, Windows ME, Windows NT, 2000 and Windows XP) has OpenGL installed by default, for Windows 95, OpenGL.org points to a download. This is, of course, only the SGI/Microsoft software renderer, but that is enough for a start.
The official way to query the OpenGL vendor is to load the OpenGL libary and then use the glGetString call to get the vendor string. Win32::API can easily load shared libraries and call functions in it, not unlike a module you wrote for Linux (I think). Finding the fitting OpenGL library headers is somewhat harder, as they first must be installed and second the script must find them - I would let the user specify that.
The SDL headers and additional SDL libraries should simply be inquired from the user if a sane set of defaults doesn't fit. Please do not enter into an infinite loop if there is no user present to answer your question, but bail out of the build script.
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