Not much yet.
Install sdl2 and sdl_image; build using makefile.
On Ubuntu 14.04 and above and other Debian-based distros, type:\
apt install libsdl2{,-image}-dev
On Fedora 25 and above, type:\
yum install SDL2{,_image}-devel
On Arch Linux, type:\
pacman -S sdl2{,_image}
On Gentoo, type:\
emerge -av libsdl2 sdl2-image
On macOS, install SDL2 via Homebrew like so:\
brew install sdl2{,_image} pkg-config
On Windows,
i686-w64-mingw32
and/or x86_64-w64-mingw32
depending on the architecture you chose into your mingw-w64 folder e.g. C:\Program Files\mingw-w64\x86_64-6.3.0-win32-seh-rt_v5-rev1\mingw64
C:\Program Files\mingw-w64\x86_64-6.3.0-win32-seh-rt_v5-rev1\mingw64\bin
and C:\Program Files\mingw-w64\x86_64-6.3.0-win32-seh-rt_v5-rev1\mingw64\x86_64-w64-mingw32\bin
pacman -S mingw-w64-x86_64-gcc mingw-w64-x86_64-SDL2{,_image}
GPLv3 or any later version. All code must be given to the project and licensed under these terms before merging.
I do not plan to sell either the source code or binaries, and will instead distribute them gratis; anyone asking you for money for this project has ripped you off.