diff -ruN wpa_supplicant/wpa_gui-qt4/wpagui.cpp-orig wpa_supplicant/wpa_gui-qt4/wpagui.cpp
--- wpa_supplicant/wpa_gui-qt4/wpagui.cpp-orig  2012-05-21 11:19:24.991137918 +0200
+++ wpa_supplicant/wpa_gui-qt4/wpagui.cpp       2012-05-21 11:17:24.175412252 +0200
@@ -22,6 +22,7 @@
 #endif /* CONFIG_NATIVE_WINDOWS */
 
 #include <cstdio>
+#include <unistd.h>
 #include <QMessageBox>
 #include <QCloseEvent>
 #include <QImageReader>