--- /dev/null
+/* Copyright (C) 1992-2018 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 Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#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
+
+/* Allocate a block that will be freed when the calling function exits. */
+extern void *alloca (size_t __size) __THROW;
+
+#ifdef __GNUC__
+# define alloca(size) __builtin_alloca (size)
+#endif /* GCC. */
+
+__END_DECLS
+
+#endif /* alloca.h */