add missing header file

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@20154 a592a061-630c-0410-9148-cb99ea01b6c8

diff --git a/src/frontends/qt4/GuiViewSource.cpp b/src/frontends/qt4/GuiViewSource.cpp
index 6683437a5887c007c170080f1dcc91e03fbeec6c..019faba5a95571334128047b1d5c5d9edb7b662d 100644 (file)
--- a/src/frontends/qt4/GuiViewSource.cpp
+++ b/src/frontends/qt4/GuiViewSource.cpp
@@ -19,7 +19,7 @@
 
 #include <QTextCursor>
 #include <QTextDocument>
-
+#include <boost/tuple/tuple.hpp>
 
 namespace lyx {
 namespace frontend {