diff -ru vidalia-0.3.1_orig/src/vidalia/plugin/PluginEngine.cpp vidalia-0.3.1/src/vidalia/plugin/PluginEngine.cpp
--- vidalia-0.3.1_orig/src/vidalia/plugin/PluginEngine.cpp	2012-08-08 18:02:01.901732270 +0200
+++ vidalia-0.3.1/src/vidalia/plugin/PluginEngine.cpp	2012-08-08 18:03:26.241677875 +0200
@@ -20,6 +20,8 @@
 
 #include "Vidalia.h"
 
+#include <unistd.h>
+
 PluginEngine::PluginEngine(QObject *parent)
   : QScriptEngine(parent)
 {