diff --git a/ap/libc/glibc/glibc-2.23/misc/regexp.h b/ap/libc/glibc/glibc-2.23/misc/regexp.h
new file mode 100644
index 0000000..6d3bc30
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/misc/regexp.h
@@ -0,0 +1,33 @@
+/* Copyright (C) 1996-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
+
+   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 _REGEXP_H
+#define _REGEXP_H	1
+
+/* The contents of this header file were originally standardized in
+   the Single Unix Specification, Issue 3 (1992).  In Issue 4 (1994)
+   the header was marked as TO BE WITHDRAWN, and new applications
+   were encouraged to use <regex.h> instead.  It was officially
+   withdrawn from the standard in Issue 6 (aka POSIX.1-2001).
+
+   The GNU C Library provided this header through version 2.22. */
+
+#error "The GNU C Library no longer implements <regexp.h>."
+#error "Please update your code to use <regex.h> instead (no trailing 'p')."
+
+#endif /* regexp.h */