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diff --git a/deps/cares/src/ares_strsplit.h b/deps/cares/src/ares_strsplit.h
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+++ b/deps/cares/src/ares_strsplit.h
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+#ifndef HEADER_CARES_STRSPLIT_H
+#define HEADER_CARES_STRSPLIT_H
+
+/* Copyright (C) 2018 by John Schember <john@nachtimwald.com>
+ *
+ * Permission to use, copy, modify, and distribute this
+ * software and its documentation for any purpose and without
+ * fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting
+ * documentation, and that the name of M.I.T. not be used in
+ * advertising or publicity pertaining to distribution of the
+ * software without specific, written prior permission.
+ * M.I.T. makes no representations about the suitability of
+ * this software for any purpose.  It is provided "as is"
+ * without express or implied warranty.
+ */
+
+#include "ares_setup.h"
+
+/* Split a string on delem skipping empty elements.
+ *
+ * param in String to split.
+ * param delims String of characters to treat as a delimitor.
+ *              Each character in the string is a delimitor so
+ *              there can be multiple delimitors to split on.
+ *              E.g. ", " will split on all comma's and spaces.
+ * param make_set Have the list be a Set where there are no
+ *                duplicate entries. 1 for true, 0 or false.
+ * param num_elm Return parameter of the number of elements
+ *               in the result array.
+ *
+ * returns an allocated array of allocated string elements.
+ *
+ */
+char **ares_strsplit(const char *in, const char *delms, int make_set, size_t *num_elm);
+
+/* Frees the result returned from ares_strsplit(). */
+void ares_strsplit_free(char **elms, size_t num_elm);
+
+
+#endif /* HEADER_CARES_STRSPLIT_H */