diff -up XSupplicant-2.2.0-src/xsupplicant-ui/xsupptray/main.cpp.gcc47 XSupplicant-2.2.0-src/xsupplicant-ui/xsupptray/main.cpp
--- XSupplicant-2.2.0-src/xsupplicant-ui/xsupptray/main.cpp.gcc47	2012-01-05 15:45:39.227669265 -0500
+++ XSupplicant-2.2.0-src/xsupplicant-ui/xsupptray/main.cpp	2012-01-05 15:45:47.510593833 -0500
@@ -30,6 +30,8 @@
  *   Nortel Networks for an OEM Commercial License.
  **/
 
+#include <unistd.h>
+
 #include "stdafx.h"
 
 extern "C" {