PNG_LIBPNG_BUILD_TYPE  493 png.h          #  define PNG_LIBPNG_BUILD_TYPE \
PNG_LIBPNG_BUILD_TYPE  497 png.h          #    define PNG_LIBPNG_BUILD_TYPE \
PNG_LIBPNG_BUILD_TYPE  500 png.h          #    define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)