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diff --git a/rts/gmp/mpz/abs.c b/rts/gmp/mpz/abs.c
new file mode 100644
index 0000000..0b5eab1
--- /dev/null
+++ b/rts/gmp/mpz/abs.c
@@ -0,0 +1,51 @@
+/* mpz_abs(dst, src) -- Assign the absolute value of SRC to DST.
+
+Copyright (C) 1991, 1993, 1994, 1995 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"
+
+void
+#if __STDC__
+mpz_abs (mpz_ptr w, mpz_srcptr u)
+#else
+mpz_abs (w, u)
+     mpz_ptr w;
+     mpz_srcptr u;
+#endif
+{
+  mp_ptr wp, up;
+  mp_size_t size;
+
+  size = ABS (u->_mp_size);
+
+  if (u != w)
+    {
+      if (w->_mp_alloc < size)
+	_mpz_realloc (w, size);
+
+      wp = w->_mp_d;
+      up = u->_mp_d;
+
+      MPN_COPY (wp, up, size);
+    }
+
+  w->_mp_size = size;
+}