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diff --git a/rts/gmp/mpz/sub.c b/rts/gmp/mpz/sub.c
deleted file mode 100644
index f3ae7c2..0000000
--- a/rts/gmp/mpz/sub.c
+++ /dev/null
@@ -1,123 +0,0 @@
-/* mpz_sub -- Subtract 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_sub (mpz_ptr w, mpz_srcptr u, mpz_srcptr v)
-#else
-mpz_sub (w, u, v)
-     mpz_ptr w;
-     mpz_srcptr u;
-     mpz_srcptr v;
-#endif
-#else /* BERKELEY_MP */
-void
-#if __STDC__
-msub (mpz_srcptr u, mpz_srcptr v, mpz_ptr w)
-#else
-msub (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;		/* The "-" makes the difference from mpz_add */
-  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;
-}