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diff --git a/mpfr/setsign.c b/mpfr/setsign.c
new file mode 100644
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--- /dev/null
+++ b/mpfr/setsign.c
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+/* mpfr_setsign -- Produce a value with the magnitude of x and sign bit s
+
+Copyright 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_setsign
+int
+mpfr_setsign (mpfr_ptr z, mpfr_srcptr x, int s, mp_rnd_t rnd_mode)
+{
+  return mpfr_set4 (z, x, rnd_mode, s ? -1 : 1);
+}