Fix so it builds on Solaris.

This commit was SVN r20758.

orte/mca/notifier/twitter/notifier_twitter_module.c

@@ -9,7 +9,7 @@
  *                         University of Stuttgart.  All rights reserved.
  * Copyright (c) 2004-2005 The Regents of the University of California.
  *                         All rights reserved.
- * Copyright (c) 2007      Sun Microsystems, Inc.  All rights reserved.
+ * Copyright (c) 2007-2009 Sun Microsystems, Inc.  All rights reserved.
  * Copyright (c) 2009      Cisco Systems, Inc. All rights reserved.
  * $COPYRIGHT$
  *
@@ -24,6 +24,7 @@
 
 #include "orte_config.h"
 
+#include <errno.h>
 #include <string.h>
 #ifdef HAVE_STDARG_H
 #include <stdarg.h>