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diff --git a/ghc/rts/gmp/mpz/cdiv_r.c b/ghc/rts/gmp/mpz/cdiv_r.c
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+++ b/ghc/rts/gmp/mpz/cdiv_r.c
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+/* mpz_cdiv_r -- Division rounding the quotient towards +infinity.  The
+   remainder gets the opposite sign as the denominator.
+
+Copyright (C) 1994, 1995, 1996 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 Library General Public License as published by
+the Free Software Foundation; either version 2 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 Library General Public
+License for more details.
+
+You should have received a copy of the GNU Library 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 "gmp.h"
+#include "gmp-impl.h"
+
+void
+#if __STDC__
+mpz_cdiv_r (mpz_ptr rem, mpz_srcptr dividend, mpz_srcptr divisor)
+#else
+mpz_cdiv_r (rem, dividend, divisor)
+     mpz_ptr rem;
+     mpz_srcptr dividend;
+     mpz_srcptr divisor;
+#endif
+{
+  mp_size_t divisor_size = divisor->_mp_size;
+  mpz_t temp_divisor;		/* N.B.: lives until function returns! */
+  TMP_DECL (marker);
+
+  TMP_MARK (marker);
+
+  /* We need the original value of the divisor after the remainder has been
+     preliminary calculated.  We have to copy it to temporary space if it's
+     the same variable as REM.  */
+  if (rem == divisor)
+    {
+
+      MPZ_TMP_INIT (temp_divisor, ABS (divisor_size));
+      mpz_set (temp_divisor, divisor);
+      divisor = temp_divisor;
+    }
+
+  mpz_tdiv_r (rem, dividend, divisor);
+
+  if ((divisor_size ^ dividend->_mp_size) >= 0 && rem->_mp_size != 0)
+    mpz_sub (rem, rem, divisor);
+
+  TMP_FREE (marker);
+}