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diff --git a/ghc/runtime/gmp/mpz_mdiv.c b/ghc/runtime/gmp/mpz_mdiv.c
new file mode 100644
index 0000000..bb8b9de
--- /dev/null
+++ b/ghc/runtime/gmp/mpz_mdiv.c
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+/* mpz_mdiv -- Mathematical DIVision and MODulo, i.e. division that rounds
+   the quotient towards -infinity.
+
+Copyright (C) 1991, 1992 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 General Public License as published by
+the Free Software Foundation; either version 2, 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with the GNU MP Library; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+
+void
+#ifdef __STDC__
+mpz_mdiv (MP_INT *quot,
+	  const MP_INT *dividend, const MP_INT *divisor)
+#else
+mpz_mdiv (quot, dividend, divisor)
+     MP_INT *quot;
+     const MP_INT *dividend;
+     const MP_INT *divisor;
+#endif
+{
+  if ((dividend->size ^ divisor->size) >= 0)
+    {
+      /* When the dividend and the divisor has same sign, this function
+	 gives same result as mpz_div.  */
+      mpz_div (quot, dividend, divisor);
+    }
+  else
+    {
+      MP_INT rem;
+
+      MPZ_TMP_INIT (&rem, 1 + ABS (dividend->size));
+
+      mpz_divmod (quot, &rem, dividend, divisor);
+      if (rem.size != 0)
+	mpz_sub_ui (quot, quot, 1);
+    }
+}