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diff --git a/Build/source/texk/kpathsea/concat.c b/Build/source/texk/kpathsea/concat.c
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+/* concat.c: dynamic string concatenation.
+
+ Copyright 1992, 1993, 2008 Karl Berry.
+ Copyright 2002, 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>
+
+
+/* Return the concatenation of S1 and S2. See `concatn.c' for a
+ `concatn', which takes a variable number of arguments. */
+
+string
+concat (const_string s1, const_string s2)
+{
+ unsigned s1len = strlen(s1);
+ unsigned s2len = strlen(s2);
+ string answer = (string) xmalloc (s1len + s2len + 1);
+ strcpy (answer, s1);
+ strcat (answer + s1len, s2);
+
+ return answer;
+}