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+/* Copyright (C) 1992 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the, 1992 Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#ifndef _ALLOCA_H
+#define _ALLOCA_H 1
+#include <features.h>
+
+#define __need_size_t
+#include <stddef.h>
+
+__BEGIN_DECLS
+
+/* Remove any previous definitions. */
+#undef __alloca
+#undef alloca
+
+/* Allocate a block that will be freed when the calling function exits. */
+extern __ptr_t __alloca __P ((size_t __size));
+extern __ptr_t alloca __P ((size_t __size));
+
+#ifdef __GNUC__
+#define __alloca(size) __builtin_alloca(size)
+#endif /* GCC. */
+
+#define alloca(size) __alloca(size)
+
+__END_DECLS
+
+#endif /* alloca.h */