When SysInfo™ is run, it looks for SDL scripts automatically under the $prefix/lib/sdl directory tree. All files ending with ".sdl" are run.

You can have SysInfo™ search your own set of SDL scripts by specifying the --sdlpath $path command line option or by setting the MCSYSINFO_SDL_PATH environment variable to a comma seperated list of directories to search for ".sdl" files.