To build with SDL support, you'll need the following files :

- SDL 1.2.x :
	http://www.libsdl.org/download-1.2.php (SDL-devel-1.2.x-VC6.zip)

- SDL_net :
	http://www.libsdl.org/projects/SDL_net/ (SDL_net-devel-1.2.x-VC6.zip)

- SDL_image :
	http://www.libsdl.org/projects/SDL_image/ (SDL_image-devel-1.2.x-VC6.zip)

Once you extracted everything, copy \include\ and \lib\ folders to \win32\ (where this file is).
You'll need to provide SDL.dll, SDL_net.dll, SDL_image.dll, jpeg.dll and libpng13.dll
(from \lib\) along with the quake3.exe (or whatever its name is) binary.