are you saying to ignore the rare .1% of the rare .1% that doesnt have sdl2 installed?
Viewing post in creating a portable linux binary
No, I am saying tell them to install SDL2 themselves. I would never ignore the 0.01 percent :).
Your particular example is tricky, because from what I remember, either apt or the Debian repos hate having both 32-bit and 64-bit SDL2 installed at once, so I would make SDL2 an exception.
I switched away from SDL2, though, partly for this reason, and now use either GLFW + OpenGL or just GDI directly.