diff --git a/ap/libc/glibc/glibc-2.23/string/argz-delete.c b/ap/libc/glibc/glibc-2.23/string/argz-delete.c
new file mode 100644
index 0000000..f274f41
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/string/argz-delete.c
@@ -0,0 +1,41 @@
+/* Routines for dealing with '\0' separated arg vectors.
+   Copyright (C) 1995-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Written by Miles Bader <miles@gnu.org>
+
+   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/>.  */
+
+#include <argz.h>
+#include <string.h>
+#include <stdlib.h>
+
+/* Delete ENTRY from ARGZ & ARGZ_LEN, if any.  */
+void
+argz_delete (char **argz, size_t *argz_len, char *entry)
+{
+  if (entry)
+    /* Get rid of the old value for NAME.  */
+    {
+      size_t entry_len = strlen (entry) + 1;
+      *argz_len -= entry_len;
+      memmove (entry, entry + entry_len, *argz_len - (entry - *argz));
+      if (*argz_len == 0)
+	{
+	  free (*argz);
+	  *argz = 0;
+	}
+    }
+}
+libc_hidden_def (argz_delete)