Maybe some other place than GitHub, they lie in GitHub. They lie, and then become silent, like they have nothing to say. I have good memories about SourceForge, once there were people one could rely on.
Otherwise i would say, the SDL development packages for Windows MinGW are just horrible. I told a friend how to set up MinGW and SDL2 in Windows, and it was terribly difficult to explain it to someone who never compiled anything in C. I think somewhere should be a development package that has all in it, SDL_Image, SDL_ttf, separate packages for 32 and 64 bit, so it would be just bin, lib and include directories under one directory, hopefully named SDL2. One may say that one may like to use different libraries for image, font, sound, etc, but what prevents using a different library even when these libraries are in one package. The library should properly be named SDL2, not SDL, because these are two different libraries, not versions of the same library, this likely though cannot be changed any more. One says CMake now maybe, but CMake has scripts mostly only for one general case, one should be able to make it for any case, the design flaws below cannot really be solved by one more layer of complexity above. My two cents.