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+/* Invoke the system diff tool to compare two strings.
+   Copyright (C) 2016-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C 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.
+
+   The GNU C 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 the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef SUPPORT_RUN_DIFF_H
+#define SUPPORT_RUN_DIFF_H
+
+/* Compare the two NUL-terminated strings LEFT and RIGHT using the
+   diff tool.  Label the sides of the diff with LEFT_LABEL and
+   RIGHT_LABEL, respectively.
+
+   This function assumes that LEFT and RIGHT are different
+   strings.  */
+void support_run_diff (const char *left_label, const char *left,
+                       const char *right_label, const char *right);
+
+#endif /* SUPPORT_RUN_DIFF_H */