diff --git a/libstdc++-v3/include/c_compatibility/ctype.h b/libstdc++-v3/include/c_compatibility/ctype.h
index 7b57a4d118a..d975dff1529 100644
--- a/libstdc++-v3/include/c_compatibility/ctype.h
+++ b/libstdc++-v3/include/c_compatibility/ctype.h
@@ -26,11 +26,11 @@
  *  This is a Standard C++ Library header.
  */
 
-#include <cctype>
-
 #ifndef _GLIBCXX_CTYPE_H
 #define _GLIBCXX_CTYPE_H 1
 
+#include <cctype>
+
 #ifdef _GLIBCXX_NAMESPACE_C
 using std::isalnum;
 using std::isalpha;
diff --git a/libstdc++-v3/include/c_compatibility/errno.h b/libstdc++-v3/include/c_compatibility/errno.h
index 06a7e5e1ee4..402810456a5 100644
--- a/libstdc++-v3/include/c_compatibility/errno.h
+++ b/libstdc++-v3/include/c_compatibility/errno.h
@@ -26,9 +26,9 @@
  *  This is a Standard C++ Library header.
  */
 
-#include <cerrno>
-
 #ifndef _GLIBCXX_ERRNO_H
 #define _GLIBCXX_ERRNO_H 1
 
+#include <cerrno>
+
 #endif
diff --git a/libstdc++-v3/include/c_compatibility/float.h b/libstdc++-v3/include/c_compatibility/float.h
index 9d8f4b62276..3d3c994db51 100644
--- a/libstdc++-v3/include/c_compatibility/float.h
+++ b/libstdc++-v3/include/c_compatibility/float.h
@@ -26,9 +26,9 @@
  *  This is a Standard C++ Library header.
  */
 
-#include <cfloat>
-
 #ifndef _GLIBCXX_FLOAT_H
 #define _GLIBCXX_FLOAT_H 1
 
+#include <cfloat>
+
 #endif
diff --git a/libstdc++-v3/include/c_compatibility/iso646.h b/libstdc++-v3/include/c_compatibility/iso646.h
index cf95847a857..665166c7f03 100644
--- a/libstdc++-v3/include/c_compatibility/iso646.h
+++ b/libstdc++-v3/include/c_compatibility/iso646.h
@@ -26,9 +26,9 @@
  *  This is a Standard C++ Library header.
  */
 
-#include <ciso646>
-
 #ifndef _GLIBCXX_ISO646_H
 #define _GLIBCXX_ISO646_H 1
 
+#include <ciso646>
+
 #endif
diff --git a/libstdc++-v3/include/c_compatibility/limits.h b/libstdc++-v3/include/c_compatibility/limits.h
index 3c3cbd58eb1..465ad4f7d52 100644
--- a/libstdc++-v3/include/c_compatibility/limits.h
+++ b/libstdc++-v3/include/c_compatibility/limits.h
@@ -26,9 +26,9 @@
  *  This is a Standard C++ Library header.
  */
 
-#include <climits>
-
 #ifndef _GLIBCXX_LIMITS_H
 #define _GLIBCXX_LIMITS_H 1
 
+#include <climits>
+
 #endif
diff --git a/libstdc++-v3/include/c_compatibility/locale.h b/libstdc++-v3/include/c_compatibility/locale.h
index 91cf5e351aa..c7407ab5444 100644
--- a/libstdc++-v3/include/c_compatibility/locale.h
+++ b/libstdc++-v3/include/c_compatibility/locale.h
@@ -26,11 +26,11 @@
  *  This is a Standard C++ Library header.
  */
 
-#include <clocale>
-
 #ifndef _GLIBCXX_LOCALE_H
 #define _GLIBCXX_LOCALE_H 1
 
+#include <clocale>
+
 #ifdef _GLIBCXX_NAMESPACE_C
 using std::lconv;
 using std::setlocale;
diff --git a/libstdc++-v3/include/c_compatibility/setjmp.h b/libstdc++-v3/include/c_compatibility/setjmp.h
index 4ffc9e60b90..7cf1e59bb8b 100644
--- a/libstdc++-v3/include/c_compatibility/setjmp.h
+++ b/libstdc++-v3/include/c_compatibility/setjmp.h
@@ -26,11 +26,11 @@
  *  This is a Standard C++ Library header.
  */
 
-#include <csetjmp>
-
 #ifndef _GLIBCXX_SETJMP_H
 #define _GLIBCXX_SETJMP_H 1
 
+#include <csetjmp>
+
 #ifdef _GLIBCXX_NAMESPACE_C
 using std::jmp_buf;
 using std::longjmp;
diff --git a/libstdc++-v3/include/c_compatibility/signal.h b/libstdc++-v3/include/c_compatibility/signal.h
index e4d4fb2906b..9497985edb3 100644
--- a/libstdc++-v3/include/c_compatibility/signal.h
+++ b/libstdc++-v3/include/c_compatibility/signal.h
@@ -26,11 +26,11 @@
  *  This is a Standard C++ Library header.
  */
 
-#include <csignal>
-
 #ifndef _GLIBCXX_SIGNAL_H
 #define _GLIBCXX_SIGNAL_H 1
 
+#include <csignal>
+
 #ifdef _GLIBCXX_NAMESPACE_C
 using std::sig_atomic_t;
 using std::raise;
diff --git a/libstdc++-v3/include/c_compatibility/stdarg.h b/libstdc++-v3/include/c_compatibility/stdarg.h
index 39033559cdb..b93037ef155 100644
--- a/libstdc++-v3/include/c_compatibility/stdarg.h
+++ b/libstdc++-v3/include/c_compatibility/stdarg.h
@@ -26,11 +26,11 @@
  *  This is a Standard C++ Library header.
  */
 
-#include <cstdarg>
-
 #ifndef _GLIBCXX_STDARG_H
 #define _GLIBCXX_STDARG_H 1
 
+#include <cstdarg>
+
 #ifdef _GLIBCXX_NAMESPACE_C
 using std::va_list;
 #endif
diff --git a/libstdc++-v3/include/c_compatibility/stdbool.h b/libstdc++-v3/include/c_compatibility/stdbool.h
index 0ddf19a4884..1c7e70bad9a 100644
--- a/libstdc++-v3/include/c_compatibility/stdbool.h
+++ b/libstdc++-v3/include/c_compatibility/stdbool.h
@@ -26,6 +26,9 @@
  *  This is a Standard C++ Library header.
  */
 
+#ifndef _GLIBCXX_STDBOOL_H
+#define _GLIBCXX_STDBOOL_H 1
+
 #include <bits/c++config.h>
 
 #if __cplusplus >= 201103L
@@ -36,7 +39,4 @@
 # endif
 #endif
 
-#ifndef _GLIBCXX_STDBOOL_H
-#define _GLIBCXX_STDBOOL_H 1
-
 #endif
diff --git a/libstdc++-v3/include/c_compatibility/stddef.h b/libstdc++-v3/include/c_compatibility/stddef.h
index e7478d2a919..ba4aaaea96e 100644
--- a/libstdc++-v3/include/c_compatibility/stddef.h
+++ b/libstdc++-v3/include/c_compatibility/stddef.h
@@ -26,11 +26,11 @@
  *  This is a Standard C++ Library header.
  */
 
-#include <cstddef>
-
 #ifndef _GLIBCXX_STDDEF_H
 #define _GLIBCXX_STDDEF_H 1
 
+#include <cstddef>
+
 #ifdef _GLIBCXX_NAMESPACE_C
 using std::size_t;
 using std::ptrdiff_t;
diff --git a/libstdc++-v3/include/c_compatibility/stdio.h b/libstdc++-v3/include/c_compatibility/stdio.h
index 2980b143a8e..573ada2f148 100644
--- a/libstdc++-v3/include/c_compatibility/stdio.h
+++ b/libstdc++-v3/include/c_compatibility/stdio.h
@@ -26,11 +26,11 @@
  *  This is a Standard C++ Library header.
  */
 
-#include <cstdio>
-
 #ifndef _GLIBCXX_STDIO_H
 #define _GLIBCXX_STDIO_H 1
 
+#include <cstdio>
+
 #ifdef _GLIBCXX_NAMESPACE_C
 using std::FILE;
 using std::fpos_t;
diff --git a/libstdc++-v3/include/c_compatibility/string.h b/libstdc++-v3/include/c_compatibility/string.h
index 0939f092424..5cb354b09f9 100644
--- a/libstdc++-v3/include/c_compatibility/string.h
+++ b/libstdc++-v3/include/c_compatibility/string.h
@@ -26,11 +26,11 @@
  *  This is a Standard C++ Library header.
  */
 
-#include <cstring>
-
 #ifndef _GLIBCXX_STRING_H
 #define _GLIBCXX_STRING_H 1
 
+#include <cstring>
+
 #ifdef _GLIBCXX_NAMESPACE_C
 using std::memcpy;
 using std::memmove;
diff --git a/libstdc++-v3/include/c_compatibility/tgmath.h b/libstdc++-v3/include/c_compatibility/tgmath.h
index e3c264843e3..aadddd91b60 100644
--- a/libstdc++-v3/include/c_compatibility/tgmath.h
+++ b/libstdc++-v3/include/c_compatibility/tgmath.h
@@ -26,6 +26,9 @@
  *  This is a Standard C++ Library header.
  */
 
+#ifndef _GLIBCXX_TGMATH_H
+#define _GLIBCXX_TGMATH_H 1
+
 #include <bits/c++config.h>
 
 #if __cplusplus >= 201103L
@@ -36,7 +39,4 @@
 # endif
 #endif
 
-#ifndef _GLIBCXX_TGMATH_H
-#define _GLIBCXX_TGMATH_H 1
-
 #endif
diff --git a/libstdc++-v3/include/c_compatibility/time.h b/libstdc++-v3/include/c_compatibility/time.h
index 4b2efab6ec7..a7afa626293 100644
--- a/libstdc++-v3/include/c_compatibility/time.h
+++ b/libstdc++-v3/include/c_compatibility/time.h
@@ -26,11 +26,11 @@
  *  This is a Standard C++ Library header.
  */
 
-#include <ctime>
-
 #ifndef _GLIBCXX_TIME_H
 #define _GLIBCXX_TIME_H 1
 
+#include <ctime>
+
 #ifdef _GLIBCXX_NAMESPACE_C
 // Get rid of those macros defined in <time.h> in lieu of real functions.
 #undef clock
diff --git a/libstdc++-v3/include/c_compatibility/uchar.h b/libstdc++-v3/include/c_compatibility/uchar.h
index b3bbc901473..776380d3a5e 100644
--- a/libstdc++-v3/include/c_compatibility/uchar.h
+++ b/libstdc++-v3/include/c_compatibility/uchar.h
@@ -26,11 +26,11 @@
  *  This is a Standard C++ Library header.
  */
 
-#include <cuchar>
-
 #ifndef _GLIBCXX_UCHAR_H
 #define _GLIBCXX_UCHAR_H 1
 
+#include <cuchar>
+
 #ifdef _GLIBCXX_NAMESPACE_C
 
 #if (_GLIBCXX_USE_CHAR8_T \
diff --git a/libstdc++-v3/include/c_compatibility/wchar.h b/libstdc++-v3/include/c_compatibility/wchar.h
index 8dab7cb80a7..c618b1779c6 100644
--- a/libstdc++-v3/include/c_compatibility/wchar.h
+++ b/libstdc++-v3/include/c_compatibility/wchar.h
@@ -26,11 +26,11 @@
  *  This is a Standard C++ Library header.
  */
 
-#include <cwchar>
-
 #ifndef _GLIBCXX_WCHAR_H
 #define _GLIBCXX_WCHAR_H 1
 
+#include <cwchar>
+
 #ifdef _GLIBCXX_NAMESPACE_C
 using std::mbstate_t;
 
diff --git a/libstdc++-v3/include/c_compatibility/wctype.h b/libstdc++-v3/include/c_compatibility/wctype.h
index d0b24880c7f..834639d763b 100644
--- a/libstdc++-v3/include/c_compatibility/wctype.h
+++ b/libstdc++-v3/include/c_compatibility/wctype.h
@@ -26,11 +26,11 @@
  *  This is a Standard C++ Library header.
  */
 
-#include <cwctype>
-
 #ifndef _GLIBCXX_CWCTYPE_H
 #define _GLIBCXX_CWCTYPE_H 1
 
+#include <cwctype>
+
 #ifdef _GLIBCXX_NAMESPACE_C
 using std::wctype_t;
 using std::wctrans_t;
diff --git a/libstdc++-v3/include/c_global/cctype b/libstdc++-v3/include/c_global/cctype
index 925433a7d80..0c6d027ed24 100644
--- a/libstdc++-v3/include/c_global/cctype
+++ b/libstdc++-v3/include/c_global/cctype
@@ -36,14 +36,14 @@
 // ISO C++ 14882: <ccytpe>
 //
 
+#ifndef _GLIBCXX_CCTYPE
+#define _GLIBCXX_CCTYPE 1
+
 #pragma GCC system_header
 
 #include <bits/c++config.h>
 #include <ctype.h>
 
-#ifndef _GLIBCXX_CCTYPE
-#define _GLIBCXX_CCTYPE 1
-
 // Get rid of those macros defined in <ctype.h> in lieu of real functions.
 #undef isalnum
 #undef isalpha
diff --git a/libstdc++-v3/include/c_global/cerrno b/libstdc++-v3/include/c_global/cerrno
index 772d4bed8aa..5cad0795b27 100644
--- a/libstdc++-v3/include/c_global/cerrno
+++ b/libstdc++-v3/include/c_global/cerrno
@@ -36,14 +36,14 @@
 // ISO C++ 14882: 19.3  Error numbers
 //
 
+#ifndef _GLIBCXX_CERRNO
+#define _GLIBCXX_CERRNO 1
+
 #pragma GCC system_header
 
 #include <bits/c++config.h>
 #include <errno.h>
 
-#ifndef _GLIBCXX_CERRNO
-#define _GLIBCXX_CERRNO 1
-
 // Adhere to section 17.4.1.2 clause 5 of ISO 14882:1998
 #ifndef errno
 #define errno errno
diff --git a/libstdc++-v3/include/c_global/cfloat b/libstdc++-v3/include/c_global/cfloat
index 38ff8309f19..bc90e75ba57 100644
--- a/libstdc++-v3/include/c_global/cfloat
+++ b/libstdc++-v3/include/c_global/cfloat
@@ -36,14 +36,14 @@
 // ISO C++ 14882: 18.2.2  Implementation properties: C library
 //
 
+#ifndef _GLIBCXX_CFLOAT
+#define _GLIBCXX_CFLOAT 1
+
 #pragma GCC system_header
 
 #include <bits/c++config.h>
 #include <float.h>
 
-#ifndef _GLIBCXX_CFLOAT
-#define _GLIBCXX_CFLOAT 1
-
 #if __cplusplus >= 201103L
 #  ifndef DECIMAL_DIG
 #    define DECIMAL_DIG __DECIMAL_DIG__
diff --git a/libstdc++-v3/include/c_global/climits b/libstdc++-v3/include/c_global/climits
index 7e374ef0c79..3fee65d36d2 100644
--- a/libstdc++-v3/include/c_global/climits
+++ b/libstdc++-v3/include/c_global/climits
@@ -36,14 +36,14 @@
 // ISO C++ 14882: 18.2.2  Implementation properties: C library
 //
 
+#ifndef _GLIBCXX_CLIMITS
+#define _GLIBCXX_CLIMITS 1
+
 #pragma GCC system_header
 
 #include <bits/c++config.h>
 #include <limits.h>
 
-#ifndef _GLIBCXX_CLIMITS
-#define _GLIBCXX_CLIMITS 1
-
 #ifndef LLONG_MIN
 #define LLONG_MIN (-__LONG_LONG_MAX__ - 1)
 #endif
diff --git a/libstdc++-v3/include/c_global/clocale b/libstdc++-v3/include/c_global/clocale
index 74114455a66..b795f5759d1 100644
--- a/libstdc++-v3/include/c_global/clocale
+++ b/libstdc++-v3/include/c_global/clocale
@@ -36,14 +36,14 @@
 // ISO C++ 14882: 18.2.2  Implementation properties: C library
 //
 
+#ifndef _GLIBCXX_CLOCALE
+#define _GLIBCXX_CLOCALE 1
+
 #pragma GCC system_header
 
 #include <bits/c++config.h>
 #include <locale.h>
 
-#ifndef _GLIBCXX_CLOCALE
-#define _GLIBCXX_CLOCALE 1
-
 // Get rid of those macros defined in <locale.h> in lieu of real functions.
 #undef setlocale
 #undef localeconv
diff --git a/libstdc++-v3/include/c_global/cmath b/libstdc++-v3/include/c_global/cmath
index dd0174f1987..ea76f446652 100644
--- a/libstdc++-v3/include/c_global/cmath
+++ b/libstdc++-v3/include/c_global/cmath
@@ -36,6 +36,9 @@
 // ISO C++ 14882: 26.5  C library
 //
 
+#ifndef _GLIBCXX_CMATH
+#define _GLIBCXX_CMATH 1
+
 #pragma GCC system_header
 
 #include <bits/requires_hosted.h>
@@ -48,9 +51,6 @@
 #undef _GLIBCXX_INCLUDE_NEXT_C_HEADERS
 #include <bits/std_abs.h>
 
-#ifndef _GLIBCXX_CMATH
-#define _GLIBCXX_CMATH 1
-
 #define __glibcxx_want_hypot
 #define __glibcxx_want_interpolate
 #include <bits/version.h>
diff --git a/libstdc++-v3/include/c_global/csetjmp b/libstdc++-v3/include/c_global/csetjmp
index c378dfaa54c..6b1a484d539 100644
--- a/libstdc++-v3/include/c_global/csetjmp
+++ b/libstdc++-v3/include/c_global/csetjmp
@@ -36,14 +36,14 @@
 // ISO C++ 14882: 20.4.6  C library
 //
 
+#ifndef _GLIBCXX_CSETJMP
+#define _GLIBCXX_CSETJMP 1
+
 #pragma GCC system_header
 
 #include <bits/c++config.h>
 #include <setjmp.h>
 
-#ifndef _GLIBCXX_CSETJMP
-#define _GLIBCXX_CSETJMP 1
-
 // Get rid of those macros defined in <setjmp.h> in lieu of real functions.
 #undef longjmp
 
diff --git a/libstdc++-v3/include/c_global/csignal b/libstdc++-v3/include/c_global/csignal
index 4a6f25e86ea..dc8a3e00b29 100644
--- a/libstdc++-v3/include/c_global/csignal
+++ b/libstdc++-v3/include/c_global/csignal
@@ -36,14 +36,14 @@
 // ISO C++ 14882: 20.4.6  C library
 //
 
+#ifndef _GLIBCXX_CSIGNAL
+#define _GLIBCXX_CSIGNAL 1
+
 #pragma GCC system_header
 
 #include <bits/c++config.h>
 #include <signal.h>
 
-#ifndef _GLIBCXX_CSIGNAL
-#define _GLIBCXX_CSIGNAL 1
-
 // Get rid of those macros defined in <signal.h> in lieu of real functions.
 #undef raise
 
diff --git a/libstdc++-v3/include/c_global/cstdarg b/libstdc++-v3/include/c_global/cstdarg
index ed5e0509094..fd960c8ca4b 100644
--- a/libstdc++-v3/include/c_global/cstdarg
+++ b/libstdc++-v3/include/c_global/cstdarg
@@ -36,15 +36,15 @@
 // ISO C++ 14882: 20.4.6  C library
 //
 
+#ifndef _GLIBCXX_CSTDARG
+#define _GLIBCXX_CSTDARG 1
+
 #pragma GCC system_header
 
 #undef __need___va_list
 #include <bits/c++config.h>
 #include <stdarg.h>
 
-#ifndef _GLIBCXX_CSTDARG
-#define _GLIBCXX_CSTDARG 1
-
 // Adhere to section 17.4.1.2 clause 5 of ISO 14882:1998
 #ifndef va_end
 #define va_end(ap) va_end (ap)
diff --git a/libstdc++-v3/include/c_global/cstdio b/libstdc++-v3/include/c_global/cstdio
index 7674a4330c1..2b1f4fe78cd 100644
--- a/libstdc++-v3/include/c_global/cstdio
+++ b/libstdc++-v3/include/c_global/cstdio
@@ -36,14 +36,14 @@
 // ISO C++ 14882: 27.8.2  C Library files
 //
 
+#ifndef _GLIBCXX_CSTDIO
+#define _GLIBCXX_CSTDIO 1
+
 #pragma GCC system_header
 
 #include <bits/c++config.h>
 #include <stdio.h>
 
-#ifndef _GLIBCXX_CSTDIO
-#define _GLIBCXX_CSTDIO 1
-
 #if __cplusplus <= 201103L && !defined(_GLIBCXX_HAVE_GETS)
 extern "C" char* gets (char* __s) __attribute__((__deprecated__));
 #endif
diff --git a/libstdc++-v3/include/c_global/cstdlib b/libstdc++-v3/include/c_global/cstdlib
index 69e7a39eb44..e210b23e588 100644
--- a/libstdc++-v3/include/c_global/cstdlib
+++ b/libstdc++-v3/include/c_global/cstdlib
@@ -36,13 +36,13 @@
 // ISO C++ 14882: 20.4.6  C library
 //
 
+#ifndef _GLIBCXX_CSTDLIB
+#define _GLIBCXX_CSTDLIB 1
+
 #pragma GCC system_header
 
 #include <bits/c++config.h>
 
-#ifndef _GLIBCXX_CSTDLIB
-#define _GLIBCXX_CSTDLIB 1
-
 #if !_GLIBCXX_HOSTED
 // The C standard does not require a freestanding implementation to
 // provide <stdlib.h>.  However, the C++ standard does still require
diff --git a/libstdc++-v3/include/c_global/cstring b/libstdc++-v3/include/c_global/cstring
index 5ccc6cc686e..eba409fd613 100644
--- a/libstdc++-v3/include/c_global/cstring
+++ b/libstdc++-v3/include/c_global/cstring
@@ -36,15 +36,15 @@
 // ISO C++ 14882: 20.4.6  C library
 //
 
+#ifndef _GLIBCXX_CSTRING
+#define _GLIBCXX_CSTRING 1
+
 #pragma GCC system_header
 
 #define __glibcxx_want_freestanding_cstring
 #include <bits/version.h>
 #include <string.h>
 
-#ifndef _GLIBCXX_CSTRING
-#define _GLIBCXX_CSTRING 1
-
 // Get rid of those macros defined in <string.h> in lieu of real functions.
 #undef memchr
 #undef memcmp
diff --git a/libstdc++-v3/include/c_global/ctime b/libstdc++-v3/include/c_global/ctime
index cb6eb88959f..da16ba686db 100644
--- a/libstdc++-v3/include/c_global/ctime
+++ b/libstdc++-v3/include/c_global/ctime
@@ -36,14 +36,14 @@
 // ISO C++ 14882: 20.5  Date and time
 //
 
+#ifndef _GLIBCXX_CTIME
+#define _GLIBCXX_CTIME 1
+
 #pragma GCC system_header
 
 #include <bits/c++config.h>
 #include <time.h>
 
-#ifndef _GLIBCXX_CTIME
-#define _GLIBCXX_CTIME 1
-
 // Get rid of those macros defined in <time.h> in lieu of real functions.
 #undef clock
 #undef difftime
diff --git a/libstdc++-v3/include/c_global/cwchar b/libstdc++-v3/include/c_global/cwchar
index 325b3ac6bad..fabe178429f 100644
--- a/libstdc++-v3/include/c_global/cwchar
+++ b/libstdc++-v3/include/c_global/cwchar
@@ -36,6 +36,9 @@
 // ISO C++ 14882: 21.4
 //
 
+#ifndef _GLIBCXX_CWCHAR
+#define _GLIBCXX_CWCHAR 1
+
 #pragma GCC system_header
 
 #include <bits/c++config.h>
@@ -44,9 +47,6 @@
 #include <wchar.h>
 #endif
 
-#ifndef _GLIBCXX_CWCHAR
-#define _GLIBCXX_CWCHAR 1
-
 // Need to do a bit of trickery here with mbstate_t as char_traits
 // assumes it is in wchar.h, regardless of wchar_t specializations.
 #ifndef _GLIBCXX_HAVE_MBSTATE_T
diff --git a/libstdc++-v3/include/c_global/cwctype b/libstdc++-v3/include/c_global/cwctype
index 55c79d63cd2..54c8572426a 100644
--- a/libstdc++-v3/include/c_global/cwctype
+++ b/libstdc++-v3/include/c_global/cwctype
@@ -36,6 +36,9 @@
 // ISO C++ 14882: <cwctype>
 //
 
+#ifndef _GLIBCXX_CWCTYPE
+#define _GLIBCXX_CWCTYPE 1
+
 #pragma GCC system_header
 
 #include <bits/c++config.h>
@@ -50,9 +53,6 @@
 #include <wctype.h>
 #endif // _GLIBCXX_HAVE_WCTYPE_H
 
-#ifndef _GLIBCXX_CWCTYPE
-#define _GLIBCXX_CWCTYPE 1
-
 // Get rid of those macros defined in <wctype.h> in lieu of real functions.
 #undef iswalnum
 #undef iswalpha
