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diff --git a/bits/libc-header-start.h b/bits/libc-header-start.h
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+/* Handle feature test macros at the start of a header.
+ Copyright (C) 2016-2018 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/>. */
+
+/* This header is internal to glibc and should not be included outside
+ of glibc headers. Headers including it must define
+ __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION first. This header
+ cannot have multiple include guards because ISO C feature test
+ macros depend on the definition of the macro when an affected
+ header is included, not when the first system header is
+ included. */
+
+#ifndef __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION
+# error "Never include <bits/libc-header-start.h> directly."
+#endif
+
+#undef __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION
+
+#include <features.h>
+
+/* ISO/IEC TR 24731-2:2010 defines the __STDC_WANT_LIB_EXT2__
+ macro. */
+#undef __GLIBC_USE_LIB_EXT2
+#if (defined __USE_GNU \
+ || (defined __STDC_WANT_LIB_EXT2__ && __STDC_WANT_LIB_EXT2__ > 0))
+# define __GLIBC_USE_LIB_EXT2 1
+#else
+# define __GLIBC_USE_LIB_EXT2 0
+#endif
+
+/* ISO/IEC TS 18661-1:2014 defines the __STDC_WANT_IEC_60559_BFP_EXT__
+ macro. */
+#undef __GLIBC_USE_IEC_60559_BFP_EXT
+#if defined __USE_GNU || defined __STDC_WANT_IEC_60559_BFP_EXT__
+# define __GLIBC_USE_IEC_60559_BFP_EXT 1
+#else
+# define __GLIBC_USE_IEC_60559_BFP_EXT 0
+#endif
+
+/* ISO/IEC TS 18661-4:2015 defines the
+ __STDC_WANT_IEC_60559_FUNCS_EXT__ macro. */
+#undef __GLIBC_USE_IEC_60559_FUNCS_EXT
+#if defined __USE_GNU || defined __STDC_WANT_IEC_60559_FUNCS_EXT__
+# define __GLIBC_USE_IEC_60559_FUNCS_EXT 1
+#else
+# define __GLIBC_USE_IEC_60559_FUNCS_EXT 0
+#endif
+
+/* ISO/IEC TS 18661-3:2015 defines the
+ __STDC_WANT_IEC_60559_TYPES_EXT__ macro. */
+#undef __GLIBC_USE_IEC_60559_TYPES_EXT
+#if defined __USE_GNU || defined __STDC_WANT_IEC_60559_TYPES_EXT__
+# define __GLIBC_USE_IEC_60559_TYPES_EXT 1
+#else
+# define __GLIBC_USE_IEC_60559_TYPES_EXT 0
+#endif