diff --git a/ap/libc/glibc/glibc-2.23/stdlib/fmtmsg.h b/ap/libc/glibc/glibc-2.23/stdlib/fmtmsg.h
new file mode 100644
index 0000000..8b42d10
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/stdlib/fmtmsg.h
@@ -0,0 +1,105 @@
+/* Message display handling.
+   Copyright (C) 1997-2016 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/>.  */
+
+#ifndef __FMTMSG_H
+#define __FMTMSG_H	1
+
+#include <features.h>
+
+
+__BEGIN_DECLS
+
+/* Values to control `fmtmsg' function.  */
+enum
+{
+  MM_HARD = 0x001,	/* Source of the condition is hardware.  */
+#define MM_HARD MM_HARD
+  MM_SOFT = 0x002,	/* Source of the condition is software.  */
+#define MM_SOFT MM_SOFT
+  MM_FIRM = 0x004,	/* Source of the condition is firmware.  */
+#define MM_FIRM MM_FIRM
+  MM_APPL = 0x008,	/* Condition detected by application.  */
+#define MM_APPL MM_APPL
+  MM_UTIL = 0x010,	/* Condition detected by utility.  */
+#define MM_UTIL MM_UTIL
+  MM_OPSYS = 0x020,	/* Condition detected by operating system.  */
+#define MM_OPSYS MM_OPSYS
+  MM_RECOVER = 0x040,	/* Recoverable error.  */
+#define MM_RECOVER MM_RECOVER
+  MM_NRECOV = 0x080,	/* Non-recoverable error.  */
+#define MM_NRECOV MM_NRECOV
+  MM_PRINT = 0x100,	/* Display message in standard error.  */
+#define MM_PRINT MM_PRINT
+  MM_CONSOLE = 0x200	/* Display message on system console.  */
+#define MM_CONSOLE MM_CONSOLE
+};
+
+/* Values to be for SEVERITY parameter of `fmtmsg'.  */
+enum
+{
+  MM_NOSEV = 0,		/* No severity level provided for the message.  */
+#define MM_NOSEV MM_NOSEV
+  MM_HALT,		/* Error causing application to halt.  */
+#define MM_HALT MM_HALT
+  MM_ERROR,		/* Application has encountered a non-fatal fault.  */
+#define MM_ERROR MM_ERROR
+  MM_WARNING,		/* Application has detected unusual non-error
+			   condition.  */
+#define MM_WARNING MM_WARNING
+  MM_INFO		/* Informative message.  */
+#define MM_INFO MM_INFO
+};
+
+
+/* Macros which can be used as null values for the arguments of `fmtmsg'.  */
+#define MM_NULLLBL	((char *) 0)
+#define MM_NULLSEV	0
+#define MM_NULLMC	((long int) 0)
+#define MM_NULLTXT	((char *) 0)
+#define MM_NULLACT	((char *) 0)
+#define MM_NULLTAG	((char *) 0)
+
+
+/* Possible return values of `fmtmsg'.  */
+enum
+{
+  MM_NOTOK = -1,
+#define MM_NOTOK MM_NOTOK
+  MM_OK = 0,
+#define MM_OK MM_OK
+  MM_NOMSG = 1,
+#define MM_NOMSG MM_NOMSG
+  MM_NOCON = 4
+#define MM_NOCON MM_NOCON
+};
+
+
+/* Print message with given CLASSIFICATION, LABEL, SEVERITY, TEXT, ACTION
+   and TAG to console or standard error.  */
+extern int fmtmsg (long int __classification, const char *__label,
+		   int __severity, const char *__text,
+		   const char *__action, const char *__tag);
+
+#ifdef __USE_MISC
+/* Add or remove severity level.  */
+extern int addseverity (int __severity, const char *__string) __THROW;
+#endif
+
+__END_DECLS
+
+#endif /* fmtmsg.h */