#define htobe64(x) BE_64(x)
#define be64toh(x) BE_64(x)
+#elif defined(__APPLE__)
+# include <machine/endian.h>
+# include <libkern/OSByteOrder.h>
+
+# if BYTE_ORDER == LITTLE_ENDIAN
+# define htobe16(x) OSSwapConstInt16(x)
+# define htole16(x) (x)
+# define be16toh(x) OSSwapConstInt16(x)
+# define le16toh(x) (x)
+
+# define htobe32(x) OSSwapConstInt32(x)
+# define htole32(x) (x)
+# define be32toh(x) OSSwapConstInt32(x)
+# define le32toh(x) (x)
+
+# define htobe64(x) OSSwapConstInt64(x)
+# define htole64(x) (x)
+# define be64toh(x) OSSwapConstInt64(x)
+# define le64toh(x) (x)
+
+# else /* BYTE_ORDER == LITTLE_ENDIAN */
+# define htobe16(x) (x)
+# define htole16(x) OSSwapConstInt16(x)
+# define be16toh(x) (x)
+# define le16toh(x) OSSwapConstInt16(x)
+
+# define htobe32(x) (x)
+# define htole32(x) OSSwapConstInt32(x)
+# define be32toh(x) (x)
+# define le32toh(x) OSSwapConstInt32(x)
+
+# define htobe64(x) (x)
+# define htole64(x) OSSwapConstInt64(x)
+# define be64toh(x) (x)
+# define le64toh(x) OSSwapConstInt64(x)
+# endif
+
#else
#error "Please add support for your OS."
#endif