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diff --git a/ghc/rts/gmp/mpz/realloc.c b/ghc/rts/gmp/mpz/realloc.c
new file mode 100644
index 0000000..2c2a5da
--- /dev/null
+++ b/ghc/rts/gmp/mpz/realloc.c
@@ -0,0 +1,52 @@
+/* _mpz_realloc -- make the mpz_t have NEW_SIZE digits allocated.
+
+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 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_realloc (mpz_ptr m, mp_size_t new_size)
+#else
+_mpz_realloc (m, new_size)
+     mpz_ptr m;
+     mp_size_t new_size;
+#endif
+{
+  /* Never allocate zero space. */
+  if (new_size == 0)
+    new_size = 1;
+
+  m->_mp_d = (mp_ptr) (*_mp_reallocate_func) (m->_mp_d,
+					      m->_mp_alloc * BYTES_PER_MP_LIMB,
+					      new_size * BYTES_PER_MP_LIMB);
+  m->_mp_alloc = new_size;
+
+#if 0
+  /* This might break some code that reads the size field after
+     reallocation, in the case the reallocated destination and a
+     source argument are identical.  */
+  if (ABS (m->_mp_size) > new_size)
+    m->_mp_size = 0;
+#endif
+
+  return (void *) m->_mp_d;
+}