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-rw-r--r--Build/source/utils/asymptote/runmath.in2
1 files changed, 1 insertions, 1 deletions
diff --git a/Build/source/utils/asymptote/runmath.in b/Build/source/utils/asymptote/runmath.in
index ed4ad9e7bc8..c7b2ef217dd 100644
--- a/Build/source/utils/asymptote/runmath.in
+++ b/Build/source/utils/asymptote/runmath.in
@@ -304,7 +304,7 @@ Int CLZ(Int a)
Int CTZ(Int a)
{
if((uint32_t) a > 0xFFFFFFFF) return -1;
-#if __GNUC_PREREQ(3,4)
+#if __GNUC__
return __builtin_ctz(a);
#else
// find the number of trailing zeros in a 32-bit number