https://github.com/libsdl-org/SDL https://github.com/libsdl-org/SDL_image https://github.com/libsdl-org/SDL_ttf https://github.com/compuphase/minIni https://github.com/grassator/bdd-for-c https://github.com/PortMidi/portmidi https://github.com/EsotericSoftware/spine-runtimes https://github.com/Chunde/getopt-for-windows https://libwebsockets.org/repo/libwebsockets https://github.com/openssl/openssl https://www.sqlite.org/download.html (use SQLite amalgamated source code, unpack into `sqlite` directory)