PNG_LIBPNG_BUILD_BASE_TYPE  481 extra_lib/include/png/png.h           (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
PNG_LIBPNG_BUILD_BASE_TYPE  485 extra_lib/include/png/png.h             (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
PNG_LIBPNG_BUILD_BASE_TYPE  487 extra_lib/include/png/png.h #    define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)