-/* When this file is included, it may be preceded only by preprocessor
- declarations. Thanks to AIX. Therefore we include it right after
- "config.h", not later. */
-
-#ifndef _ALLOCA_H
-# define _ALLOCA_H
+/* Avoid using the symbol _ALLOCA_H here, as Bison assumes _ALLOCA_H
+ means there is a real alloca function. */
+#ifndef _GNULIB_ALLOCA_H
+# define _GNULIB_ALLOCA_H