Hi
it was done done in qt 4.4 . There is no substantial change i believe in qt 4.8.

I included the .pro file for you review


Qt Code: 
  1. QT += opengl
  2. HEADERS += \
  3.     LabelCounter.h \
  4.     FrustumMainWidget.h \
  5.     OrthoMainWidget.h \
  6.     PerspectiveMainWidget.h \
  7.     SharedWidgetData.h \
  8.     glWidgetWorldSpace.h \
  9.     glWidgetScreenSpace.h \
  10.     glm.h \
  11.     ProjectionMainWindow.h \
  12.     singleton.h \
  13.     GLToolkit.h \
  14.     GroupBoxCommandExtendedBox.h
  15.  
  16. SOURCES += \
  17.     LabelCounter.cpp \
  18.     FrustumMainWidget.cpp \
  19.     OrthoMainWidget.cpp \
  20.     PerspectiveMainWidget.cpp \
  21.     SharedWidgetData.cpp \
  22.     glWidgetWorldSpace.cpp \
  23.     glWidgetScreenSpace.cpp \
  24.     glm.cpp \
  25.     ProjectionMainWindow.cpp \
  26.     main.cpp \
  27.     GLToolkit.cpp \
  28.     GroupBoxCommandExtendedBox.cpp
  29.  
  30. FORMS += \
  31.     projection.ui \
  32.     perspective.ui \
  33.     ortho.ui \
  34.     frustum.ui
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Thanks
Sajjadul