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diff --git a/StdLib/Include/sys/featuretest.h b/StdLib/Include/sys/featuretest.h
deleted file mode 100644
index f36396af17..0000000000
--- a/StdLib/Include/sys/featuretest.h
+++ /dev/null
@@ -1,73 +0,0 @@
-/*	$NetBSD: featuretest.h,v 1.8 2005/12/11 12:25:20 christos Exp $	*/
-
-/*
- * Written by Klaus Klein <kleink@NetBSD.org>, February 2, 1998.
- * Public domain.
- *
- * NOTE: Do not protect this header against multiple inclusion.  Doing
- * so can have subtle side-effects due to header file inclusion order
- * and testing of e.g. _POSIX_SOURCE vs. _POSIX_C_SOURCE.  Instead,
- * protect each CPP macro that we want to supply.
- */
-
-/*
- * Feature-test macros are defined by several standards, and allow an
- * application to specify what symbols they want the system headers to
- * expose, and hence what standard they want them to conform to.
- * There are two classes of feature-test macros.  The first class
- * specify complete standards, and if one of these is defined, header
- * files will try to conform to the relevant standard.  They are:
- *
- * ANSI macros:
- * _ANSI_SOURCE			ANSI C89
- *
- * POSIX macros:
- * _POSIX_SOURCE == 1		IEEE Std 1003.1 (version?)
- * _POSIX_C_SOURCE == 1		IEEE Std 1003.1-1990
- * _POSIX_C_SOURCE == 2		IEEE Std 1003.2-1992
- * _POSIX_C_SOURCE == 199309L	IEEE Std 1003.1b-1993
- * _POSIX_C_SOURCE == 199506L	ISO/IEC 9945-1:1996
- * _POSIX_C_SOURCE == 200112L	IEEE Std 1003.1-2001
- *
- * X/Open macros:
- * _XOPEN_SOURCE		System Interfaces and Headers, Issue 4, Ver 2
- * _XOPEN_SOURCE_EXTENDED == 1	XSH4.2 UNIX extensions
- * _XOPEN_SOURCE == 500		System Interfaces and Headers, Issue 5
- * _XOPEN_SOURCE == 520		Networking Services (XNS), Issue 5.2
- * _XOPEN_SOURCE == 600		IEEE Std 1003.1-2001, XSI option
- *
- * NetBSD macros:
- * _NETBSD_SOURCE == 1		Make all NetBSD features available.
- *
- * If more than one of these "major" feature-test macros is defined,
- * then the set of facilities provided (and namespace used) is the
- * union of that specified by the relevant standards, and in case of
- * conflict, the earlier standard in the above list has precedence (so
- * if both _POSIX_C_SOURCE and _NETBSD_SOURCE are defined, the version
- * of rename() that's used is the POSIX one).  If none of the "major"
- * feature-test macros is defined, _NETBSD_SOURCE is assumed.
- *
- * There are also "minor" feature-test macros, which enable extra
- * functionality in addition to some base standard.  They should be
- * defined along with one of the "major" macros.  The "minor" macros
- * are:
- *
- * _REENTRANT
- * _ISOC99_SOURCE
- * _LARGEFILE_SOURCE		Large File Support
- *		<http://ftp.sas.com/standards/large.file/x_open.20Mar96.html>
- */
-
-#if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
-#define _POSIX_C_SOURCE	1L
-#endif
-
-#if !defined(_ANSI_SOURCE) && !defined(_POSIX_C_SOURCE) && \
-    !defined(_XOPEN_SOURCE) && !defined(_NETBSD_SOURCE)
-#define _NETBSD_SOURCE 1
-#endif
-
-#if ((_POSIX_C_SOURCE - 0) >= 199506L || (_XOPEN_SOURCE - 0) >= 500) && \
-    !defined(_REENTRANT)
-#define _REENTRANT
-#endif