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diff --git a/gmp/mpf/iset_str.c b/gmp/mpf/iset_str.c
new file mode 100644
index 00000000..82a6f2e4
--- /dev/null
+++ b/gmp/mpf/iset_str.c
@@ -0,0 +1,33 @@
+/* mpf_init_set_str -- Initialize a float and assign it from a string.
+
+Copyright 1995, 1996, 2000, 2001, 2004 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 3 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.  If not, see http://www.gnu.org/licenses/.  */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+
+int
+mpf_init_set_str (mpf_ptr r, const char *s, int base)
+{
+  mp_size_t prec = __gmp_default_fp_limb_precision;
+  r->_mp_size = 0;
+  r->_mp_exp = 0;
+  r->_mp_prec = prec;
+  r->_mp_d = (mp_ptr) (*__gmp_allocate_func) ((prec + 1) * BYTES_PER_MP_LIMB);
+
+  return mpf_set_str (r, s, base);
+}