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diff --git a/src/libs/libgroff/mkstemp.cpp b/src/libs/libgroff/mkstemp.cpp
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+/* Copyright (C) 2001-2020 Free Software Foundation, Inc.
+ Written by Werner Lemberg (wl@gnu.org)
+
+This file is part of groff.
+
+groff 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 3 of the License, or
+(at your option) any later version.
+
+groff 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, see <http://www.gnu.org/licenses/>. */
+
+
+/* This file is heavily based on the file mkstemp.c which is part of the
+ fileutils package. */
+
+
+extern int gen_tempname(char *, int);
+
+/* Generate a unique temporary file name from TEMPLATE.
+ The last six characters of TEMPLATE must be "XXXXXX";
+ they are replaced with a string that makes the filename unique.
+ Then open the file and return a fd. */
+int mkstemp(char *tmpl)
+{
+ return gen_tempname(tmpl, 0);
+}