--- a/ui/qt/qt4.pro	Mon Jan 05 18:47:07 2015 +0100
+++ b/ui/qt/qt4.pro	Wed Jan 07 17:25:33 2015 +0100
@@ -44,6 +44,7 @@
 SOURCES += text.cpp
 SOURCES += model.cpp
 SOURCES += tree.cpp
+SOURCES += button.cpp
 
 HEADERS += toolkit.h
 HEADERS += window.h
@@ -53,5 +54,6 @@
 HEADERS += container.h
 HEADERS += text.h
 HEADERS += model.h
-HEADESR += tree.h
+HEADERS += tree.h
+HEADERS += button.h