PNG_LIBPNG_BUILD_BASE_TYPE  540 third_party/libpng/png.h           (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
PNG_LIBPNG_BUILD_BASE_TYPE  544 third_party/libpng/png.h             (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
PNG_LIBPNG_BUILD_BASE_TYPE  546 third_party/libpng/png.h #    define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)