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diff --git a/gmp/mp_set_fns.c b/gmp/mp_set_fns.c
new file mode 100644
index 00000000..f5402c6f
--- /dev/null
+++ b/gmp/mp_set_fns.c
@@ -0,0 +1,39 @@
+/* mp_set_memory_functions -- Set the allocate, reallocate, and free functions
+   for use by the mp package.
+
+Copyright 1991, 1993, 1994, 2000, 2001 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP 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 3 of the License, or (at your
+option) any later version.
+
+The GNU MP 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 MP Library.  If not, see http://www.gnu.org/licenses/.  */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+
+void
+mp_set_memory_functions (void *(*alloc_func) (size_t),
+			 void *(*realloc_func) (void *, size_t, size_t),
+			 void (*free_func) (void *, size_t))
+{
+  if (alloc_func == 0)
+    alloc_func = __gmp_default_allocate;
+  if (realloc_func == 0)
+    realloc_func = __gmp_default_reallocate;
+  if (free_func == 0)
+    free_func = __gmp_default_free;
+
+  __gmp_allocate_func = alloc_func;
+  __gmp_reallocate_func = realloc_func;
+  __gmp_free_func = free_func;
+}