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diff --git a/gmp/mpq/get_str.c b/gmp/mpq/get_str.c
new file mode 100644
index 00000000..9b3f7ffb
--- /dev/null
+++ b/gmp/mpq/get_str.c
@@ -0,0 +1,65 @@
+/* mpq_get_str -- mpq to string conversion.
+
+Copyright 2001, 2002, 2006 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 <stdio.h>
+#include <string.h>
+#include "gmp.h"
+#include "gmp-impl.h"
+
+char *
+mpq_get_str (char *str, int base, mpq_srcptr q)
+{
+  size_t  str_alloc, len;
+
+  ASSERT (ABS(base) >= 2);
+  ASSERT (ABS(base) <= 62);
+
+  str_alloc = 0;
+  if (str == NULL)
+    {
+      /* This is an overestimate since we don't bother checking how much of
+         the high limbs of num and den are used.  +2 for rounding up the
+         chars per bit of num and den.  +3 for sign, slash and '\0'.  */
+      str_alloc = ((size_t) ((ABS (q->_mp_num._mp_size) + q->_mp_den._mp_size)
+                             * BITS_PER_MP_LIMB
+                             * __mp_bases[ABS(base)].chars_per_bit_exactly))
+                   + 5;
+      str = (char *) (*__gmp_allocate_func) (str_alloc);
+    }
+
+  mpz_get_str (str, base, mpq_numref(q));
+  len = strlen (str);
+  if (! MPZ_EQUAL_1_P (mpq_denref (q)))
+    {
+      str[len++] = '/';
+      mpz_get_str (str+len, base, mpq_denref(q));
+      len += strlen (str+len);
+    }
+
+  ASSERT (len == strlen(str));
+  ASSERT (str_alloc == 0 || len+1 <= str_alloc);
+  ASSERT (len+1 <=  /* size recommended to applications */
+          mpz_sizeinbase (mpq_numref(q), ABS(base)) +
+          mpz_sizeinbase (mpq_denref(q), ABS(base)) + 3);
+
+  if (str_alloc != 0)
+    __GMP_REALLOCATE_FUNC_MAYBE_TYPE (str, str_alloc, len+1, char);
+
+  return str;
+}