diff --git a/libio/ChangeLog b/libio/ChangeLog
index 5c9836ee7b0..ec2fd437739 100644
--- a/libio/ChangeLog
+++ b/libio/ChangeLog
@@ -1,3 +1,8 @@
+2000-11-28  Geoffrey Keating  <geoffk@redhat.com>
+	    Felix Lee  <flee@redhat.com>
+
+	* gen-params: Put in cases for O_EXCL, O_APPEND not being defined.
+
 2000-10-18  Jakub Jelinek  <jakub@redhat.com>
 
 	* iostream.cc (ends): Release the acquired lock.
diff --git a/libio/gen-params b/libio/gen-params
index 464bb2f0e82..d83c31b6099 100755
--- a/libio/gen-params
+++ b/libio/gen-params
@@ -1,5 +1,5 @@
 #!/bin/sh
-# Copyright (C) 1992, 1993, 1994, 1997, 1998, 1999 Free Software Foundation
+# Copyright (C) 1992, 1993, 1994, 1997, 1998, 1999, 2000 Free Software Foundation
 # 
 # This file is part of the GNU IO Library.  This library is free
 # software; you can redistribute it and/or modify it under the
@@ -188,6 +188,40 @@ else
   echo "#define ${macro_prefix}HAVE_ST_BLKSIZE 0"
 fi
 
+# A little test program to check if there is an O_APPEND.
+cat >dummy.c <<!EOF!
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+int foo()
+{
+    return O_APPEND;
+}
+!EOF!
+
+if ${CC} -c dummy.c >/dev/null 2>&1 ; then
+  :
+else
+  echo "#define O_APPEND 0"
+fi
+
+# A little test program to check if there is an O_EXCL.
+cat >dummy.c <<!EOF!
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+int foo()
+{
+    return O_EXCL;
+}
+!EOF!
+
+if ${CC} -c dummy.c >/dev/null 2>&1 ; then
+  :
+else
+  echo "#define O_EXCL 0"
+fi
+
 # A little test program to check if the name 'clog' is defined in libm,
 # as it is under DEC UNIX.
 cat >dummy.c <<!EOF!