diff --git a/ap/libc/glibc/glibc-2.23/stdlib/fpioconst.h b/ap/libc/glibc/glibc-2.23/stdlib/fpioconst.h
new file mode 100644
index 0000000..df0185f
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/stdlib/fpioconst.h
@@ -0,0 +1,74 @@
+/* Header file for constants used in floating point <-> decimal conversions.
+   Copyright (C) 1995-2016 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 _FPIOCONST_H
+#define	_FPIOCONST_H
+
+#include <float.h>
+#include <math.h>
+#include <gmp.h>
+
+
+/* These values are used by __printf_fp, where they are noncritical (if the
+   value is not large enough, it will just be slower); and by
+   strtof/strtod/strtold, where it is critical (it's used for overflow
+   detection).
+
+   XXX These should be defined in <float.h>.  For the time being, we have the
+   IEEE754 values here.  */
+
+#if !defined __NO_LONG_DOUBLE_MATH && __LDBL_MAX_EXP__ > 1024
+# define LDBL_MAX_10_EXP_LOG	12 /* = floor(log_2(LDBL_MAX_10_EXP)) */
+#else
+# define LDBL_MAX_10_EXP_LOG	8 /* = floor(log_2(LDBL_MAX_10_EXP)) */
+#endif
+#define DBL_MAX_10_EXP_LOG	8 /* = floor(log_2(DBL_MAX_10_EXP)) */
+#define FLT_MAX_10_EXP_LOG	5 /* = floor(log_2(FLT_MAX_10_EXP)) */
+
+/* For strtold, we need powers of 10 up to floor (log_2 (LDBL_MANT_DIG
+   - LDBL_MIN_EXP + 2)).  */
+#if !defined __NO_LONG_DOUBLE_MATH && __LDBL_MAX_EXP__ > 1024
+# define FPIOCONST_POW10_ARRAY_SIZE	15
+#else
+# define FPIOCONST_POW10_ARRAY_SIZE	11
+#endif
+
+/* The array with the number representation. */
+extern const mp_limb_t __tens[] attribute_hidden;
+
+/* Table of powers of ten.  This is used by __printf_fp and by
+   strtof/strtod/strtold.  */
+struct mp_power
+  {
+    size_t arrayoff;		/* Offset in `__tens'.  */
+    mp_size_t arraysize;	/* Size of the array.  */
+    int p_expo;			/* Exponent of the number 10^(2^i).  */
+    int m_expo;			/* Exponent of the number 10^-(2^i-1).  */
+  };
+extern const struct mp_power _fpioconst_pow10[FPIOCONST_POW10_ARRAY_SIZE]
+     attribute_hidden;
+
+/* The constants in the array `_fpioconst_pow10' have an offset.  */
+#if BITS_PER_MP_LIMB == 32
+# define _FPIO_CONST_OFFSET	2
+#else
+# define _FPIO_CONST_OFFSET	1
+#endif
+
+
+#endif	/* fpioconst.h */