"64 bit versions" -- for testing

I have been able to put together MinGW on Vista, compile SDL and
libAgar, but not SDL_image or SDL_mixer, or their related libraries
(libTIFF, libJPEG, libOgg, libVorbis, etc.)

This is because of the volatility of Vista and the lack of support by
the lib owners thus far.–
H. E. Gilliland III

“Astronomy compels the soul to look upwards and leads us from this
world to another.”
? Plato