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diff --git a/rts/gmp/mpz/gcd_ui.c b/rts/gmp/mpz/gcd_ui.c
new file mode 100644
index 0000000..f3bec58
--- /dev/null
+++ b/rts/gmp/mpz/gcd_ui.c
@@ -0,0 +1,65 @@
+/* mpz_gcd_ui -- Calculate the greatest common divisior of two integers.
+
+Copyright (C) 1994, 1996, 1999, 2000 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 2.1 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; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+MA 02111-1307, USA. */
+
+#include <stdio.h> /* for NULL */
+#include "gmp.h"
+#include "gmp-impl.h"
+
+unsigned long int
+#if __STDC__
+mpz_gcd_ui (mpz_ptr w, mpz_srcptr u, unsigned long int v)
+#else
+mpz_gcd_ui (w, u, v)
+     mpz_ptr w;
+     mpz_srcptr u;
+     unsigned long int v;
+#endif
+{
+  mp_size_t size;
+  mp_limb_t res;
+
+  size = ABS (u->_mp_size);
+
+  if (size == 0)
+    res = v;
+  else if (v == 0)
+    {
+      if (w != NULL && u != w)
+	{
+	  if (w->_mp_alloc < size)
+	    _mpz_realloc (w, size);
+
+	  MPN_COPY (w->_mp_d, u->_mp_d, size);
+	}
+      w->_mp_size = size;
+      /* We can't return any useful result for gcd(big,0).  */
+      return size > 1 ? 0 : w->_mp_d[0];
+    }
+  else
+    res = mpn_gcd_1 (u->_mp_d, size, (mp_limb_t) v);
+
+  if (w != NULL)
+    {
+      w->_mp_d[0] = res;
+      w->_mp_size = 1;
+    }
+  return res;
+}