Each Render Manager implementation may have a dependency on third party libraries. These dependencies are listed as follows.
Used for font loading http://www.freetype.org
Used for rendering http://www.libsdl.org
Used for image loading and rendering http://www.libsdl.org/projects/SDL_image
PNG format, used by SDL_image http://www.libpng.org/pub/png/libpng.html
Compression library, required by libpng http://www.zlib.net/
JPEG format, used by SDL_image http://www.ijg.org/
Used for font loading and rendering. http://www.libsdl.org/projects/SDL_ttf/
Font loading, used by SDL_ttf http://www.freetype.org