#define BIG_ENDIAN 4321 /* most-significant byte first (IBM, net) */
#define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long (pdp) */
-#if _BIG_ENDIAN /* Predefined by compiler */
+#ifdef __BIG_ENDIAN__ /* Predefined by compiler */
#define BYTE_ORDER BIG_ENDIAN /* byte order we use on ppc */
#define ENDIAN BIG
#else