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diff --git a/ghc/rts/gmp/mpz/iset_str.c b/ghc/rts/gmp/mpz/iset_str.c
new file mode 100644
index 0000000..e04ad5d
--- /dev/null
+++ b/ghc/rts/gmp/mpz/iset_str.c
@@ -0,0 +1,44 @@
+/* mpz_init_set_str(string, base) -- Convert the \0-terminated string
+   STRING in base BASE to a multiple precision integer.  Return a MP_INT
+   structure representing the integer.  Allow white space in the
+   string.  If BASE == 0 determine the base in the C standard way,
+   i.e.  0xhh...h means base 16, 0oo...o means base 8, otherwise
+   assume base 10.
+
+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"
+
+int
+#if __STDC__
+mpz_init_set_str (mpz_ptr x, const char *str, int base)
+#else
+mpz_init_set_str (x, str, base)
+     mpz_ptr x;
+     const char *str;
+     int base;
+#endif
+{
+  x->_mp_alloc = 1;
+  x->_mp_d = (mp_ptr) (*_mp_allocate_func) (BYTES_PER_MP_LIMB);
+
+  return mpz_set_str (x, str, base);
+}