Hi there! Git repo updated, now it builds and works on Windows too (build done using Visual Studio 2017). Take into account that as there's no no default library path for SDL2 in Windows, libs, headers and dlls should be placed in ./ext folder. README.txt files are provided for ./ext subfolders, so you know where files should go.
Also, I didn't use GLEW in the end, sou you can see how GL extensions can be loaded using SDL_GL_GetProcAddress.