-#if defined(__GNUC__) && !defined(C_ALLOCA)
-# undef alloca
-# define alloca __builtin_alloca
-#else
-# if defined(HAVE_ALLOCA_H) && !defined(C_ALLOCA)
-# include <alloca.h>
-# else
-# ifndef alloca /* predefined by HP cc +Olibcalls */
-# if !defined (__STDC__) && !defined (__hpux)
-char *alloca ();
-# else
-void *alloca ();
-# endif /* __STDC__, __hpux */
-# endif /* alloca */
-# endif /* HAVE_ALLOCA_H */
-#endif
-