FindSDL_image

尋找 SDL_image 函式庫

此模組定義了

SDL_IMAGE_LIBRARIES, the name of the library to link against
SDL_IMAGE_INCLUDE_DIRS, where to find the headers
SDL_IMAGE_FOUND, if false, do not try to link against
SDL_IMAGE_VERSION_STRING - human-readable string containing the
                           version of SDL_image

為了向後相容，也會設定以下變數

SDLIMAGE_LIBRARY (same value as SDL_IMAGE_LIBRARIES)
SDLIMAGE_INCLUDE_DIR (same value as SDL_IMAGE_INCLUDE_DIRS)
SDLIMAGE_FOUND (same value as SDL_IMAGE_FOUND)

$SDLDIR 是一個環境變數，對應於建置 SDL 時使用的 ./configure --prefix=$SDLDIR。