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diff --git a/Build/source/texk/kpathsea/c-errno.h b/Build/source/texk/kpathsea/c-errno.h
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+/* c-errno.h: <errno.h> and the errno variable.
+
+ Copyright 1992, 2008 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/>. */
+
+#ifndef KPATHSEA_C_ERRNO_H
+#define KPATHSEA_C_ERRNO_H
+
+#include <errno.h>
+#ifndef errno
+extern int errno;
+#endif
+
+#endif /* not KPATHSEA_C_ERRNO_H */