Thanks to generous help from my pal @SupSuper, Decker can now optionally be compiled against SDL and SDL_Image v1.2, with some functionality removed or reduced. This paves the way for using Decker on a variety of older operating systems and platforms. It's no longer necessary to compile SDL2 from scratch on the default OLPC OS image, for example, and if anyone is still interested in a Windows 98 port it should only require a few tweaks to the makefile!