Revision control
++ QT += widgets
++ requires(qtConfig(combobox))
++
++ HEADERS = imagecomposer.h
++ SOURCES = imagecomposer.cpp \
++ main.cpp
++ RESOURCES = imagecomposition.qrc
++
++ # install
++ target.path = $$[QT_INSTALL_EXAMPLES]/widgets/painting/imagecomposition
++ INSTALLS += target