Windows & Mac: https://www.libsdl.org/download-2.0.php
Debian/Ubuntu: sudo apt-get install libsdl2-dev

GAPDaTsar:

@wolfy1339 (View Post)

 What do you mean by Debian: sudo apt-get libsdl2-dev?

 

that command installs SDL2 developement libraries from a package downloaded from the internet. you type that into the console if you're on one of those systems