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diff --git a/gmp/mpq/set.c b/gmp/mpq/set.c
new file mode 100644
index 00000000..5d527be9
--- /dev/null
+++ b/gmp/mpq/set.c
@@ -0,0 +1,41 @@
+/* mpq_set(dest,src) -- Set DEST to SRC.
+
+Copyright 1991, 1994, 1995, 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
+mpq_set (MP_RAT *dest, const MP_RAT *src)
+{
+  mp_size_t num_size, den_size;
+  mp_size_t abs_num_size;
+
+  num_size = src->_mp_num._mp_size;
+  abs_num_size = ABS (num_size);
+  if (dest->_mp_num._mp_alloc < abs_num_size)
+    _mpz_realloc (&(dest->_mp_num), abs_num_size);
+  MPN_COPY (dest->_mp_num._mp_d, src->_mp_num._mp_d, abs_num_size);
+  dest->_mp_num._mp_size = num_size;
+
+  den_size = src->_mp_den._mp_size;
+  if (dest->_mp_den._mp_alloc < den_size)
+    _mpz_realloc (&(dest->_mp_den), den_size);
+  MPN_COPY (dest->_mp_den._mp_d, src->_mp_den._mp_d, den_size);
+  dest->_mp_den._mp_size = den_size;
+}