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diff --git a/rts/gmp/mpz/cmpabs.c b/rts/gmp/mpz/cmpabs.c
new file mode 100644
index 0000000..037d7a9
--- /dev/null
+++ b/rts/gmp/mpz/cmpabs.c
@@ -0,0 +1,57 @@
+/* mpz_cmpabs(u,v) -- Compare U, V.  Return postive, zero, or negative
+   based on if U > V, U == V, or U < V.
+
+Copyright (C) 1991, 1993, 1994, 1996, 1997, 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"
+
+int
+#if __STDC__
+mpz_cmpabs (mpz_srcptr u, mpz_srcptr v)
+#else
+mpz_cmpabs (u, v)
+     mpz_srcptr u;
+     mpz_srcptr v;
+#endif
+{
+  mp_size_t usize = u->_mp_size;
+  mp_size_t vsize = v->_mp_size;
+  mp_size_t size;
+  mp_srcptr up, vp;
+  int cmp;
+
+  usize = ABS (usize);
+  vsize = ABS (vsize);
+
+  if (usize != vsize)
+    return usize - vsize;
+
+  if (usize == 0)
+    return 0;
+
+  up = u->_mp_d;
+  vp = v->_mp_d;
+
+  cmp = mpn_cmp (up, vp, usize);
+
+  return cmp;
+}