--- Digest-Hashcash/Hashcash.xs	2003/09/11 06:20:26	1.3
+++ Digest-Hashcash/Hashcash.xs	2003/10/20 04:17:05	1.4
@@ -37,19 +37,21 @@
 
 #if defined(U64TYPE) && (defined(USE_64_BIT_INT) || ((BYTEORDER != 0x1234) && (BYTEORDER != 0x4321)))
 typedef U64TYPE ULONG;
-# if BYTEORDER == 0x1234
-#   undef BYTEORDER
-#   define BYTEORDER 0x12345678
-# elif BYTEORDER == 0x4321
-#   undef BYTEORDER
-#   define BYTEORDER 0x87654321   
-# endif
+#  if BYTEORDER == 0x1234
+#    undef BYTEORDER
+#    define BYTEORDER 0x12345678
+#  elif BYTEORDER == 0x4321
+#    undef BYTEORDER
+#    define BYTEORDER 0x87654321   
+#  endif
 #else
 typedef uint_fast32_t ULONG;     /* 32-or-more-bit quantity */
 #endif
 
 #if GCCX86ASM
 #  define zprefix(n) ({ int _r; __asm__ ("bsrl %1, %0" : "=r" (_r) : "r" (n)); 31 - _r ; })
+#elif __GNUC__ > 2 && __GNUC_MINOR__ > 3
+#  define zprefix(n) (__extension__ ({ uint32_t n__ = (n); n ? __builtin_clz (n) : 32; }))
 #else
 static int zprefix (ULONG n)
 {