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diff --git a/rts/gmp/mpz/add.c b/rts/gmp/mpz/add.c
new file mode 100644
index 0000000..a22c377
--- /dev/null
+++ b/rts/gmp/mpz/add.c
@@ -0,0 +1,123 @@
+/* mpz_add -- Add two integers.
+
+Copyright (C) 1991, 1993, 1994, 1996, 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 "gmp.h"
+#include "gmp-impl.h"
+#ifdef BERKELEY_MP
+#include "mp.h"
+#endif
+
+#ifndef BERKELEY_MP
+void
+#if __STDC__
+mpz_add (mpz_ptr w, mpz_srcptr u, mpz_srcptr v)
+#else
+mpz_add (w, u, v)
+     mpz_ptr w;
+     mpz_srcptr u;
+     mpz_srcptr v;
+#endif
+#else /* BERKELEY_MP */
+void
+#if __STDC__
+madd (mpz_srcptr u, mpz_srcptr v, mpz_ptr w)
+#else
+madd (u, v, w)
+     mpz_srcptr u;
+     mpz_srcptr v;
+     mpz_ptr w;
+#endif
+#endif /* BERKELEY_MP */
+{
+  mp_srcptr up, vp;
+  mp_ptr wp;
+  mp_size_t usize, vsize, wsize;
+  mp_size_t abs_usize;
+  mp_size_t abs_vsize;
+
+  usize = u->_mp_size;
+  vsize = v->_mp_size;
+  abs_usize = ABS (usize);
+  abs_vsize = ABS (vsize);
+
+  if (abs_usize < abs_vsize)
+    {
+      /* Swap U and V. */
+      MPZ_SRCPTR_SWAP (u, v);
+      MP_SIZE_T_SWAP (usize, vsize);
+      MP_SIZE_T_SWAP (abs_usize, abs_vsize);
+    }
+
+  /* True: ABS_USIZE >= ABS_VSIZE.  */
+
+  /* If not space for w (and possible carry), increase space.  */
+  wsize = abs_usize + 1;
+  if (w->_mp_alloc < wsize)
+    _mpz_realloc (w, wsize);
+
+  /* These must be after realloc (u or v may be the same as w).  */
+  up = u->_mp_d;
+  vp = v->_mp_d;
+  wp = w->_mp_d;
+
+  if ((usize ^ vsize) < 0)
+    {
+      /* U and V have different sign.  Need to compare them to determine
+	 which operand to subtract from which.  */
+
+      /* This test is right since ABS_USIZE >= ABS_VSIZE.  */
+      if (abs_usize != abs_vsize)
+	{
+	  mpn_sub (wp, up, abs_usize, vp, abs_vsize);
+	  wsize = abs_usize;
+	  MPN_NORMALIZE (wp, wsize);
+	  if (usize < 0)
+	    wsize = -wsize;
+	}
+      else if (mpn_cmp (up, vp, abs_usize) < 0)
+	{
+	  mpn_sub_n (wp, vp, up, abs_usize);
+	  wsize = abs_usize;
+	  MPN_NORMALIZE (wp, wsize);
+	  if (usize >= 0)
+	    wsize = -wsize;
+	}
+      else
+	{
+	  mpn_sub_n (wp, up, vp, abs_usize);
+	  wsize = abs_usize;
+	  MPN_NORMALIZE (wp, wsize);
+	  if (usize < 0)
+	    wsize = -wsize;
+	}
+    }
+  else
+    {
+      /* U and V have same sign.  Add them.  */
+      mp_limb_t cy_limb = mpn_add (wp, up, abs_usize, vp, abs_vsize);
+      wp[abs_usize] = cy_limb;
+      wsize = abs_usize + cy_limb;
+      if (usize < 0)
+	wsize = -wsize;
+    }
+
+  w->_mp_size = wsize;
+}