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diff --git a/gnulib-local/lib/xalloc.h b/gnulib-local/lib/xalloc.h
new file mode 100644
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+++ b/gnulib-local/lib/xalloc.h
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+/* malloc with out of memory checking.
+   Copyright (C) 2001-2004, 2006 Free Software Foundation, Inc.
+   Written by Bruno Haible <haible@clisp.cons.org>, 2001.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef _XALLOC_H
+#define _XALLOC_H
+
+#include <stddef.h>
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/* Defined in xmalloc.c.  */
+
+/* Allocate SIZE bytes of memory dynamically, with error checking.  */
+extern void *xmalloc (size_t size);
+
+/* Allocate memory for NMEMB elements of SIZE bytes, with error checking.
+   SIZE must be > 0.  */
+extern void *xnmalloc (size_t nmemb, size_t size);
+
+/* Allocate SIZE bytes of memory dynamically, with error checking,
+   and zero it.  */
+extern void *xzalloc (size_t size);
+
+/* Allocate memory for NMEMB elements of SIZE bytes, with error checking,
+   and zero it.  */
+extern void *xcalloc (size_t nmemb, size_t size);
+
+/* Change the size of an allocated block of memory PTR to SIZE bytes,
+   with error checking.  If PTR is NULL, run xmalloc.  */
+extern void *xrealloc (void *ptr, size_t size);
+#ifdef __cplusplus
+}
+template <typename T>
+  inline T * xrealloc (T * ptr, size_t size)
+  {
+    return (T *) xrealloc ((void *) ptr, size);
+  }
+extern "C" {
+#endif
+
+/* This function is always triggered when memory is exhausted.  It is
+   in charge of honoring the three previous items.  This is the
+   function to call when one wants the program to die because of a
+   memory allocation failure.  */
+extern void xalloc_die (void)
+#if (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 5)) && !__STRICT_ANSI__
+     __attribute__ ((__noreturn__))
+#endif
+     ;
+
+/* In the following macros, T must be an elementary or structure/union or
+   typedef'ed type, or a pointer to such a type.  To apply one of the
+   following macros to a function pointer or array type, you need to typedef
+   it first and use the typedef name.  */
+
+/* Allocate an object of type T dynamically, with error checking.  */
+/* extern T *XMALLOC (typename T); */
+#define XMALLOC(T) \
+  ((T *) xmalloc (sizeof (T)))
+
+/* Allocate memory for NMEMB elements of type T, with error checking.  */
+/* extern T *XNMALLOC (size_t nmemb, typename T); */
+#if HAVE_INLINE
+/* xnmalloc performs a division and multiplication by sizeof (T).  Arrange to
+   perform the division at compile-time and the multiplication with a factor
+   known at compile-time.  */
+# define XNMALLOC(N,T) \
+   ((T *) (sizeof (T) == 1 \
+           ? xmalloc (N) \
+           : xnboundedmalloc(N, (size_t) (sizeof (ptrdiff_t) <= sizeof (size_t) ? -1 : -2) / sizeof (T), sizeof (T))))
+static inline void *
+xnboundedmalloc (size_t n, size_t bound, size_t s)
+{
+  if (n > bound)
+    xalloc_die ();
+  return xmalloc (n * s);
+}
+#else
+# define XNMALLOC(N,T) \
+   ((T *) (sizeof (T) == 1 ? xmalloc (N) : xnmalloc (N, sizeof (T))))
+#endif
+
+/* Allocate an object of type T dynamically, with error checking,
+   and zero it.  */
+/* extern T *XZALLOC (typename T); */
+#define XZALLOC(T) \
+  ((T *) xzalloc (sizeof (T)))
+
+/* Allocate memory for NMEMB elements of type T, with error checking,
+   and zero it.  */
+/* extern T *XCALLOC (size_t nmemb, typename T); */
+#define XCALLOC(N,T) \
+  ((T *) xcalloc (N, sizeof (T)))
+
+/* Return a pointer to a new buffer of N bytes.  This is like xmalloc,
+   except it returns char *.  */
+#define xcharalloc(N) \
+  XNMALLOC (N, char)
+
+
+/* Defined in xstrdup.c.  */
+
+/* Return a newly allocated copy of the N bytes of memory starting at P.  */
+extern void *xmemdup (const void *p, size_t n);
+#ifdef __cplusplus
+}
+template <typename T>
+  inline T * xmemdup (const T * p, size_t n)
+  {
+    return (T *) xmemdup ((const void *) p, n);
+  }
+extern "C" {
+#endif
+
+/* Return a newly allocated copy of STRING.  */
+extern char *xstrdup (const char *string);
+
+
+/* Return 1 if an array of N objects, each of size S, cannot exist due
+   to size arithmetic overflow.  S must be positive and N must be
+   nonnegative.  This is a macro, not an inline function, so that it
+   works correctly even when SIZE_MAX < N.
+
+   By gnulib convention, SIZE_MAX represents overflow in size
+   calculations, so the conservative dividend to use here is
+   SIZE_MAX - 1, since SIZE_MAX might represent an overflowed value.
+   However, malloc (SIZE_MAX) fails on all known hosts where
+   sizeof (ptrdiff_t) <= sizeof (size_t), so do not bother to test for
+   exactly-SIZE_MAX allocations on such hosts; this avoids a test and
+   branch when S is known to be 1.  */
+# define xalloc_oversized(n, s) \
+    ((size_t) (sizeof (ptrdiff_t) <= sizeof (size_t) ? -1 : -2) / (s) < (n))
+
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif /* _XALLOC_H */