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-rw-r--r--common/mem.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/common/mem.h b/common/mem.h
index 980ea139..af89ba6f 100644
--- a/common/mem.h
+++ b/common/mem.h
@@ -41,7 +41,9 @@ extern "C" {
#ifdef HAVE_ALLOCA_H
# include <alloca.h>
#elif defined __GNUC__
+#if !defined alloca
# define alloca __builtin_alloca
+#endif
#elif defined _AIX
# define alloca __alloca
#elif defined _MSC_VER