Simple DirectMedia Layer - "classic" implementation as non-default

 SDL is a library that allows programs portable low level access to a video
 framebuffer, audio output, mouse, and keyboard.
 .
 This package contains the shared library, but installs it to a location
 where it will not be used by default. To use "classic" SDL2 by default,
 please install the libsdl2-2.0-0 package.
 .
 This can also be used in conjunction with the libsdl2-compat-shim package,
 to make SDL2 games use sdl2-compat by default, with "classic" SDL2
 available as a fallback by setting environment variable
 SDL_DYNAMIC_API='/usr/$LIB/sdl2-classic/libSDL2-2.0.so.0'
 or adding '/usr/$LIB/sdl2-classic' to the LD_LIBRARY_PATH environment
 variable.