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diff --git a/Build/source/texk/kpathsea/xftell.c b/Build/source/texk/kpathsea/xftell.c
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+/* xftell.c: ftell with error checking.
+
+ Copyright 1992, 1993, 1995, 2008, 2011 Karl Berry.
+ Copyright 2005 Olaf Weber.
+
+ This 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.
+
+ This 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 this library; if not, see <http://www.gnu.org/licenses/>. */
+
+#include <kpathsea/config.h>
+
+long
+xftell (FILE *f, const_string filename)
+{
+ long where = ftell (f);
+
+ if (where < 0)
+ FATAL_PERROR(filename);
+
+ return where;
+}