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diff --git a/contrib/glnx-backport-autoptr.h b/contrib/glnx-backport-autoptr.h
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+++ b/contrib/glnx-backport-autoptr.h
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+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
+ *
+ * Copyright (C) 2015 Colin Walters <walters@verbum.org>
+ * 
+ * GLIB - Library of useful routines for C programming
+ * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
+ *
+ * This 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 of the License, or (at your option) any later version.
+ *
+ * This 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 this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#pragma once
+
+#include <gio/gio.h>
+
+G_BEGIN_DECLS
+
+#if !GLIB_CHECK_VERSION(2, 43, 4)
+
+#define _GLIB_AUTOPTR_FUNC_NAME(TypeName) glib_autoptr_cleanup_##TypeName
+#define _GLIB_AUTOPTR_TYPENAME(TypeName)  TypeName##_autoptr
+#define _GLIB_AUTO_FUNC_NAME(TypeName)    glib_auto_cleanup_##TypeName
+#define _GLIB_CLEANUP(func)               __attribute__((cleanup(func)))
+#define _GLIB_DEFINE_AUTOPTR_CHAINUP(ModuleObjName, ParentName) \
+  typedef ModuleObjName *_GLIB_AUTOPTR_TYPENAME(ModuleObjName);                                          \
+  static inline void _GLIB_AUTOPTR_FUNC_NAME(ModuleObjName) (ModuleObjName **_ptr) {                     \
+    _GLIB_AUTOPTR_FUNC_NAME(ParentName) ((ParentName **) _ptr); }                                        \
+
+
+/* these macros are API */
+#define G_DEFINE_AUTOPTR_CLEANUP_FUNC(TypeName, func) \
+  typedef TypeName *_GLIB_AUTOPTR_TYPENAME(TypeName);                                                           \
+  G_GNUC_BEGIN_IGNORE_DEPRECATIONS                                                                              \
+  static inline void _GLIB_AUTOPTR_FUNC_NAME(TypeName) (TypeName **_ptr) { if (*_ptr) (func) (*_ptr); }         \
+  G_GNUC_END_IGNORE_DEPRECATIONS
+#define G_DEFINE_AUTO_CLEANUP_CLEAR_FUNC(TypeName, func) \
+  G_GNUC_BEGIN_IGNORE_DEPRECATIONS                                                                              \
+  static inline void _GLIB_AUTO_FUNC_NAME(TypeName) (TypeName *_ptr) { (func) (_ptr); }                         \
+  G_GNUC_END_IGNORE_DEPRECATIONS
+#define G_DEFINE_AUTO_CLEANUP_FREE_FUNC(TypeName, func, none) \
+  G_GNUC_BEGIN_IGNORE_DEPRECATIONS                                                                              \
+  static inline void _GLIB_AUTO_FUNC_NAME(TypeName) (TypeName *_ptr) { if (*_ptr != none) (func) (*_ptr); }     \
+  G_GNUC_END_IGNORE_DEPRECATIONS
+#define g_autoptr(TypeName) _GLIB_CLEANUP(_GLIB_AUTOPTR_FUNC_NAME(TypeName)) _GLIB_AUTOPTR_TYPENAME(TypeName)
+#define g_auto(TypeName) _GLIB_CLEANUP(_GLIB_AUTO_FUNC_NAME(TypeName)) TypeName
+#define g_autofree _GLIB_CLEANUP(g_autoptr_cleanup_generic_gfree)
+
+/**
+ * g_steal_pointer:
+ * @pp: a pointer to a pointer
+ *
+ * Sets @pp to %NULL, returning the value that was there before.
+ *
+ * Conceptually, this transfers the ownership of the pointer from the
+ * referenced variable to the "caller" of the macro (ie: "steals" the
+ * reference).
+ *
+ * The return value will be properly typed, according to the type of
+ * @pp.
+ *
+ * This can be very useful when combined with g_autoptr() to prevent the
+ * return value of a function from being automatically freed.  Consider
+ * the following example (which only works on GCC and clang):
+ *
+ * |[
+ * GObject *
+ * create_object (void)
+ * {
+ *   g_autoptr(GObject) obj = g_object_new (G_TYPE_OBJECT, NULL);
+ *
+ *   if (early_error_case)
+ *     return NULL;
+ *
+ *   return g_steal_pointer (&obj);
+ * }
+ * ]|
+ *
+ * It can also be used in similar ways for 'out' parameters and is
+ * particularly useful for dealing with optional out parameters:
+ *
+ * |[
+ * gboolean
+ * get_object (GObject **obj_out)
+ * {
+ *   g_autoptr(GObject) obj = g_object_new (G_TYPE_OBJECT, NULL);
+ *
+ *   if (early_error_case)
+ *     return FALSE;
+ *
+ *   if (obj_out)
+ *     *obj_out = g_steal_pointer (&obj);
+ *
+ *   return TRUE;
+ * }
+ * ]|
+ *
+ * In the above example, the object will be automatically freed in the
+ * early error case and also in the case that %NULL was given for
+ * @obj_out.
+ *
+ * Since: 2.44
+ */
+static inline gpointer
+(g_steal_pointer) (gpointer pp)
+{
+  gpointer *ptr = (gpointer *) pp;
+  gpointer ref;
+
+  ref = *ptr;
+  *ptr = NULL;
+
+  return ref;
+}
+
+/* type safety */
+#define g_steal_pointer(pp) \
+  (0 ? (*(pp)) : (g_steal_pointer) (pp))
+
+#endif /* !GLIB_CHECK_VERSION(2, 43, 3) */
+
+G_END_DECLS