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diff --git a/mpfr/set_dfl_prec.c b/mpfr/set_dfl_prec.c
new file mode 100644
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--- /dev/null
+++ b/mpfr/set_dfl_prec.c
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+/* mpfr_set_default_prec, mpfr_get_default_prec -- set/get default precision
+
+Copyright 1999, 2000, 2001, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+Contributed by the Arenaire and Cacao projects, INRIA.
+
+This file is part of the GNU MPFR Library.
+
+The GNU MPFR 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 MPFR 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 MPFR Library; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+MA 02110-1301, USA. */
+
+#include "mpfr-impl.h"
+
+/* default is IEEE double precision, i.e. 53 bits */
+mp_prec_t MPFR_THREAD_ATTR __gmpfr_default_fp_bit_precision \
+  = IEEE_DBL_MANT_DIG;
+
+void
+mpfr_set_default_prec (mp_prec_t prec)
+{
+  MPFR_ASSERTN (prec >= MPFR_PREC_MIN && prec <= MPFR_PREC_MAX);
+  __gmpfr_default_fp_bit_precision = prec;
+}
+
+#undef mpfr_get_default_prec
+mp_prec_t
+mpfr_get_default_prec (void)
+{
+  return __gmpfr_default_fp_bit_precision;
+}