Index: rfb/rfbproto.h
--- rfb/rfbproto.h.orig
+++ rfb/rfbproto.h
@@ -79,7 +79,7 @@ typedef int8_t rfbBool;
 
 #if LIBVNCSERVER_HAVE_ENDIAN_H
 # include <endian.h>
-# if __BYTE_ORDER == __BIG_ENDIAN
+# if BYTE_ORDER == BIG_ENDIAN
 #  define LIBVNCSERVER_WORDS_BIGENDIAN 1
 # endif
 #endif