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diff --git a/gnulib/lib/isinf.c b/gnulib/lib/isinf.c
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+/* Test for positive or negative infinity.
+ Copyright (C) 2007-2011 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ This program 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation,
+ Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+
+/* Written by Ben Pfaff <blp@gnu.org>, 2008. */
+
+#include <config.h>
+
+#include <float.h>
+
+int
+gl_isinff (float x)
+{
+ return x < -FLT_MAX || x > FLT_MAX;
+}
+
+int
+gl_isinfd (double x)
+{
+ return x < -DBL_MAX || x > DBL_MAX;
+}
+
+int
+gl_isinfl (long double x)
+{
+ return x < -LDBL_MAX || x > LDBL_MAX;
+}