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-rw-r--r--ewah/ewok.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/ewah/ewok.h b/ewah/ewok.h
index 43adeb5..4b95847 100644
--- a/ewah/ewok.h
+++ b/ewah/ewok.h
@@ -47,7 +47,8 @@ static inline uint32_t ewah_bit_popcount64(uint64_t x)
return (x * 0x0101010101010101ULL) >> 56;
}
-#ifdef __GNUC__
+/* __builtin_ctzll was not available until 3.4.0 */
+#if defined(__GNUC__) && (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR > 3))
#define ewah_bit_ctz64(x) __builtin_ctzll(x)
#else
static inline int ewah_bit_ctz64(uint64_t x)