diff --git a/ap/libc/glibc/glibc-2.23/string/strdup.c b/ap/libc/glibc/glibc-2.23/string/strdup.c
new file mode 100644
index 0000000..21e8ee2
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/string/strdup.c
@@ -0,0 +1,54 @@
+/* Copyright (C) 1991-2016 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/>.  */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#if defined _LIBC || defined  STDC_HEADERS
+# include <stdlib.h>
+# include <string.h>
+#else
+char *malloc ();
+char *memcpy ();
+#endif
+
+#undef __strdup
+#undef strdup
+
+#ifndef weak_alias
+# define __strdup strdup
+#endif
+
+/* Duplicate S, returning an identical malloc'd string.  */
+char *
+__strdup (const char *s)
+{
+  size_t len = strlen (s) + 1;
+  void *new = malloc (len);
+
+  if (new == NULL)
+    return NULL;
+
+  return (char *) memcpy (new, s, len);
+}
+#ifdef libc_hidden_def
+libc_hidden_def (__strdup)
+#endif
+#ifdef weak_alias
+weak_alias (__strdup, strdup)
+#endif