-#ifdef __GNUC__
-# ifndef alloca
-# define alloca __builtin_alloca
-# endif
-#else
-# ifdef _MSC_VER
-# include <malloc.h>
-# define alloca _alloca
-# else
-# if HAVE_ALLOCA_H
-# include <alloca.h>
-# else
-# ifdef _AIX
- #pragma alloca
-# else
-# ifdef __hpux /* This section must match that of bison generated files. */
-# ifdef __cplusplus
-extern "C" void *alloca (unsigned int);
-# else /* not __cplusplus */
-void *alloca ();
-# endif /* not __cplusplus */
-# else /* not __hpux */
-# ifndef alloca
-char *alloca ();
-# endif
-# endif /* __hpux */
-# endif
-# endif
-# endif
-#endif