From Mathieu Marache, "I tried the latest developper release 1.9.4 and found that I hadn't

the osgsimpleviewerQt4 example in my Visual studio solutions... After
looking into it it seems that you cannot have both Qt3 and Qt4
enabled. After modifying the root CMakeLists.txt to use :

FIND_PACKAGE(Qt)  which should ask you to choose betwwen Qt3 and Qt4
if you have both

instead of :

FIND_PACKAGE(Qt3)
FIND_PACKAGE(Qt4)

I had the project generated. But then due to the way CMake handles Qt4
I had to modify osgsimpleviewerQt4's CMakeLists.txt to have the binary
link with QtOpengl4. "

examples/osgsimpleviewerQT4/CMakeLists.txt

@@ -1,3 +1,7 @@
+#configure what we need from Qt4
+SET(QT_USE_QTOPENGL yes)
+INCLUDE(UseQt4)
+
 SET(TARGET_SRC osgsimpleviewerQT4.cpp )
 
 SET(TARGET_EXTERNAL_LIBRARIES ${QT_LIBRARIES} )