diff --git a/newlib/ChangeLog b/newlib/ChangeLog
index 6797a0c63..1768d4794 100644
--- a/newlib/ChangeLog
+++ b/newlib/ChangeLog
@@ -1,3 +1,8 @@
+Sat Mar 17 18:30:00 2001  Corinna Vinschen <corinna@vinschen.de>
+
+	* libc/include/sys/unistd.h: Add _PC_POSIX_PERMISSONS and
+	_PC_POSIX_SECURITY constants for Cygwin.
+
 Wed Mar 14  9:34:00 2001  Corinna Vinschen <corinna@vinschen.de>
 
 	* libc/sys/cygwin/crt0.c: Add copyright hint.
diff --git a/newlib/libc/include/sys/unistd.h b/newlib/libc/include/sys/unistd.h
index 9741dafb5..2da98790b 100644
--- a/newlib/libc/include/sys/unistd.h
+++ b/newlib/libc/include/sys/unistd.h
@@ -228,6 +228,12 @@ extern const unsigned _cygwin_X_OK;
 # define	_PC_ASYNC_IO            9
 # define	_PC_PRIO_IO            10
 # define	_PC_SYNC_IO            11
+#ifdef __CYGWIN__
+/* Ask for POSIX permission bits support. */
+# define	_PC_POSIX_PERMISSIONS   90
+/* Ask for full POSIX permission support including uid/gid settings. */
+# define	_PC_POSIX_SECURITY     91
+#endif
 
 /* FIXME: This is temporary until winsup gets sorted out.  */
 #ifdef __CYGWIN__