diff --git a/newlib/ChangeLog b/newlib/ChangeLog
index 31ea045d9..8febaee23 100644
--- a/newlib/ChangeLog
+++ b/newlib/ChangeLog
@@ -1,3 +1,10 @@
+2011-07-20  Yaakov Selkowitz  <yselkowitz@...>
+
+	* libc/include/time.h [_POSIX_CLOCK_SELECTION] (clock_nanosleep):
+	Declare.
+	* libc/include/sys/features.h [__CYGWIN__] (_POSIX_CLOCK_SELECTION):
+	Define.
+
 2011-07-19  Yaakov Selkowitz  <yselkowitz@users.sourceforge.net>
 
 	* libc/include/sys/unistd.h (_CS_XBS5_WIDTH_RESTRICTED_ENVS): Define.
diff --git a/newlib/libc/include/sys/features.h b/newlib/libc/include/sys/features.h
index 5de4bbbe8..e7f9c65dd 100644
--- a/newlib/libc/include/sys/features.h
+++ b/newlib/libc/include/sys/features.h
@@ -102,7 +102,7 @@ extern "C" {
 /* #define _POSIX_ASYNCHRONOUS_IO		    -1 */
 /* #define _POSIX_BARRIERS			    -1 */
 #define _POSIX_CHOWN_RESTRICTED			     1
-/* #define _POSIX_CLOCK_SELECTION		    -1 */
+#define _POSIX_CLOCK_SELECTION			200112L
 #define _POSIX_CPUTIME			    	200112L
 #define _POSIX_FSYNC				200112L
 #define _POSIX_IPV6				200112L
diff --git a/newlib/libc/include/time.h b/newlib/libc/include/time.h
index 7d3b2abd3..306bad619 100644
--- a/newlib/libc/include/time.h
+++ b/newlib/libc/include/time.h
@@ -175,6 +175,22 @@ int _EXFUN(nanosleep, (const struct timespec  *rqtp, struct timespec *rmtp));
 #endif
 #endif /* _POSIX_TIMERS */
 
+#if defined(_POSIX_CLOCK_SELECTION)
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int _EXFUN(clock_nanosleep,
+  (clockid_t clock_id, int flags, const struct timespec *rqtp,
+   struct timespec *rmtp));
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _POSIX_CLOCK_SELECTION */
+
 #ifdef __cplusplus
 extern "C" {
 #endif