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diff --git a/mpfr/stack_interface.c b/mpfr/stack_interface.c
new file mode 100644
index 00000000..02249f7a
--- /dev/null
+++ b/mpfr/stack_interface.c
@@ -0,0 +1,104 @@
+/* mpfr_stack -- initialize a floating-point number with given allocation area
+
+Copyright 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"
+
+#undef mpfr_custom_get_size
+size_t
+mpfr_custom_get_size (mp_prec_t prec)
+{
+  return (prec + BITS_PER_MP_LIMB -1) / BITS_PER_MP_LIMB * BYTES_PER_MP_LIMB;
+}
+
+#undef mpfr_custom_init
+void
+mpfr_custom_init (void *mantissa, mp_prec_t prec)
+{
+  return ;
+}
+
+#undef mpfr_custom_get_mantissa
+void *
+mpfr_custom_get_mantissa (mpfr_srcptr x)
+{
+  return (void*) MPFR_MANT (x);
+}
+
+#undef mpfr_custom_get_exp
+mp_exp_t
+mpfr_custom_get_exp (mpfr_srcptr x)
+{
+  return MPFR_EXP (x);
+}
+
+#undef mpfr_custom_move
+void
+mpfr_custom_move (mpfr_ptr x, void *new_position)
+{
+  MPFR_MANT (x) = (mp_limb_t *) new_position;
+}
+
+#undef mpfr_custom_init_set
+void
+mpfr_custom_init_set (mpfr_ptr x, int kind, mp_exp_t exp,
+                     mp_prec_t prec, void *mantissa)
+{
+  mpfr_kind_t t;
+  int s;
+  mp_exp_t e;
+
+  if (kind >= 0)
+    {
+      t = (mpfr_kind_t) kind;
+      s = MPFR_SIGN_POS;
+    }
+  else
+    {
+      t = (mpfr_kind_t) -kind;
+      s = MPFR_SIGN_NEG;
+    }
+  MPFR_ASSERTD (t <= MPFR_REGULAR_KIND);
+  e = MPFR_LIKELY (t == MPFR_REGULAR_KIND) ? exp :
+    MPFR_UNLIKELY (t == MPFR_NAN_KIND) ? MPFR_EXP_NAN :
+    MPFR_UNLIKELY (t == MPFR_INF_KIND) ? MPFR_EXP_INF : MPFR_EXP_ZERO;
+
+  MPFR_PREC (x) = prec;
+  MPFR_SET_SIGN (x, s);
+  MPFR_EXP (x) = e;
+  MPFR_MANT (x) = (mp_limb_t*) mantissa;
+  return;
+}
+
+#undef mpfr_custom_get_kind
+int
+mpfr_custom_get_kind (mpfr_srcptr x)
+{
+  if (MPFR_LIKELY (!MPFR_IS_SINGULAR (x)))
+    return (int) MPFR_REGULAR_KIND * MPFR_INT_SIGN (x);
+  if (MPFR_IS_INF (x))
+    return (int) MPFR_INF_KIND * MPFR_INT_SIGN (x);
+  if (MPFR_IS_NAN (x))
+    return (int) MPFR_NAN_KIND;
+  MPFR_ASSERTD (MPFR_IS_ZERO (x));
+  return (int) MPFR_ZERO_KIND * MPFR_INT_SIGN (x);
+}
+