diff --git a/src/Gui/Quarter/QuarterWidget.cpp b/src/Gui/Quarter/QuarterWidget.cpp
index 8bc9f6db31..a34263dc11 100644
--- a/src/Gui/Quarter/QuarterWidget.cpp
+++ b/src/Gui/Quarter/QuarterWidget.cpp
@@ -67,6 +67,7 @@
 #include <QResizeEvent>
 #include <QWindow>
 
+#include <Inventor/C/basic.h>
 #if COIN_MAJOR_VERSION >= 4
 #include <Inventor/SbByteBuffer.h>
 #endif
diff --git a/src/Gui/SoMouseWheelEvent.h b/src/Gui/SoMouseWheelEvent.h
index 05a6ce841a..a08b49a7b8 100644
--- a/src/Gui/SoMouseWheelEvent.h
+++ b/src/Gui/SoMouseWheelEvent.h
@@ -28,7 +28,7 @@
 //#endif
 
 #include <Inventor/events/SoEvent.h>
-
+#include <Inventor/events/SoSubEvent.h>
 
 /**
  * @brief The SoMouseWheelEvent class is a temporary replacement for
diff --git a/src/Gui/SoTouchEvents.h b/src/Gui/SoTouchEvents.h
index b0814c7577..ccba4add80 100644
--- a/src/Gui/SoTouchEvents.h
+++ b/src/Gui/SoTouchEvents.h
@@ -27,7 +27,7 @@
 #include <Quarter/devices/InputDevice.h>
 #include <Inventor/SbLinear.h>
 #include <Inventor/events/SoEvent.h>
-
+#include <Inventor/events/SoSubEvent.h>
 
 class QWidget;
 
diff --git a/src/Gui/View3DInventorExamples.cpp b/src/Gui/View3DInventorExamples.cpp
index d1430eda5b..2c096a7010 100644
--- a/src/Gui/View3DInventorExamples.cpp
+++ b/src/Gui/View3DInventorExamples.cpp
@@ -23,7 +23,7 @@
 #include "PreCompiled.h"
 
 #ifndef _PreComp_
-# include <string>
+# include <cstring>
 # include <Inventor/SbClip.h>
 # include <Inventor/nodes/SoComplexity.h>
 # include <Inventor/nodes/SoCoordinate3.h>