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-rw-r--r--configure.ac1
1 files changed, 1 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac
index 4cfdedb1461..b8e3161e116 100644
--- a/configure.ac
+++ b/configure.ac
@@ -122,6 +122,7 @@ fi
dnl Check for compiler builtins
AX_GCC_BUILTIN([__builtin_bswap32])
+AX_GCC_BUILTIN([__builtin_bswap64])
AM_CONDITIONAL([GEN_ASM_OFFSETS], test "x$GEN_ASM_OFFSETS" = xyes)