Qt4- DOn't assumer string has been included

diff --git a/modules/gui/qt4/components/simple_preferences.cpp b/modules/gui/qt4/components/simple_preferences.cpp
index e2db8c1cb8f90562f2800b0ec4c6586e10f2abec..9e25a52dd7c2bb79025e914ce253a115d8d4be42 100644 (file)
--- a/modules/gui/qt4/components/simple_preferences.cpp
+++ b/modules/gui/qt4/components/simple_preferences.cpp
@@ -39,6 +39,8 @@
 #include <QUrl>
 #include <QVBoxLayout>
 
+#include <string>
+
 #define ICON_HEIGHT 64
 #define BUTTON_HEIGHT 74