diff --git a/ap/libc/glibc/glibc-2.23/assert/assert.c b/ap/libc/glibc/glibc-2.23/assert/assert.c
new file mode 100644
index 0000000..8e8e298
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/assert/assert.c
@@ -0,0 +1,104 @@
+/* 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/>.  */
+
+#include <assert.h>
+#include <atomic.h>
+#include <ldsodefs.h>
+#include <libintl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sysdep.h>
+#include <unistd.h>
+#include <sys/mman.h>
+
+
+extern const char *__progname;
+
+#include <wchar.h>
+#include <libio/iolibio.h>
+#define fflush(s) _IO_fflush (s)
+
+/* This function, when passed a string containing an asserted
+   expression, a filename, and a line number, prints a message
+   on the standard error stream of the form:
+	a.c:10: foobar: Assertion `a == b' failed.
+   It then aborts program execution via a call to `abort'.  */
+
+#ifdef FATAL_PREPARE_INCLUDE
+# include FATAL_PREPARE_INCLUDE
+#endif
+
+
+void
+__assert_fail_base (const char *fmt, const char *assertion, const char *file,
+		    unsigned int line, const char *function)
+{
+  char *str;
+
+#ifdef FATAL_PREPARE
+  FATAL_PREPARE;
+#endif
+
+  int total;
+  if (__asprintf (&str, fmt,
+		  __progname, __progname[0] ? ": " : "",
+		  file, line,
+		  function ? function : "", function ? ": " : "",
+		  assertion, &total) >= 0)
+    {
+      /* Print the message.  */
+      (void) __fxprintf (NULL, "%s", str);
+      (void) fflush (stderr);
+
+      total = (total + 1 + GLRO(dl_pagesize) - 1) & ~(GLRO(dl_pagesize) - 1);
+      struct abort_msg_s *buf = __mmap (NULL, total, PROT_READ | PROT_WRITE,
+					MAP_ANON | MAP_PRIVATE, -1, 0);
+      if (__glibc_likely (buf != MAP_FAILED))
+	{
+	  buf->size = total;
+	  strcpy (buf->msg, str);
+
+	  /* We have to free the old buffer since the application might
+	     catch the SIGABRT signal.  */
+	  struct abort_msg_s *old = atomic_exchange_acq (&__abort_msg, buf);
+
+	  if (old != NULL)
+	    __munmap (old, old->size);
+	}
+
+      free (str);
+    }
+  else
+    {
+      /* At least print a minimal message.  */
+      static const char errstr[] = "Unexpected error.\n";
+      __libc_write (STDERR_FILENO, errstr, sizeof (errstr) - 1);
+    }
+
+  abort ();
+}
+
+
+#undef __assert_fail
+void
+__assert_fail (const char *assertion, const char *file, unsigned int line,
+	       const char *function)
+{
+  __assert_fail_base (_("%s%s%s:%u: %s%sAssertion `%s' failed.\n%n"),
+		      assertion, file, line, function);
+}
+hidden_def(__assert_fail)