diff --git a/newlib/ChangeLog b/newlib/ChangeLog
index 16093e724..7685a7cd9 100644
--- a/newlib/ChangeLog
+++ b/newlib/ChangeLog
@@ -1,3 +1,7 @@
+Wed Mar 27 07:34:44 2002  Jason Tishler <jason@tishler.net>
+
+	* libc/include/sys/features.h (_POSIX_SEMAPHORES): New Cygwin define.
+
 Tue Mar 26 17:17:10 2002  J"orn Rennecke <joern.rennecke@superh.com>
 
 	* libc/machine/sh/memcpy.S (Large): Fix alignment rounding.
diff --git a/newlib/libc/include/sys/features.h b/newlib/libc/include/sys/features.h
index e86ce1344..f69c803ff 100644
--- a/newlib/libc/include/sys/features.h
+++ b/newlib/libc/include/sys/features.h
@@ -86,6 +86,7 @@ extern "C" {
 # define _POSIX_THREAD_SAFE_FUNCTIONS            1
 # define _POSIX_THREAD_PRIORITY_SCHEDULING       1
 # define _POSIX_THREAD_ATTR_STACKSIZE            1
+# define _POSIX_SEMAPHORES                       1
 #endif
 
 #ifdef __cplusplus