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Just build you app using whatever pieces of Qt you need then tie to ROS as follows. Add the find_package(Qt COMPONENTS ... REQUIRED) in your CMakeLists.txt file and the appropriate lines for moc and resource files as needed. For example;

FIND_PACKAGE(Qt4 REQUIRED)
INCLUDE(${QT_USE_FILE})

file(GLOB QT_FORMS RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} *.ui)
file(GLOB QT_RESOURCES RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} *.qrc)
file(GLOB_RECURSE QT_MOC RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} FOLLOW_SYMLINKS *.h)

QT4_ADD_RESOURCES(QT_RESOURCES_CPP ${QT_RESOURCES})
QT4_WRAP_CPP(QT_MOC_HPP ${QT_MOC})
QT4_WRAP_UI(QT_FORMS_HPP ${QT_FORMS})

And link as needed

add_executable([some_binary] ${QT_SOURCES} ${QT_RESOURCES_CPP} ${QT_FORMS_HPP} ${QT_MOC_HPP})

target_link_libraries([some_binary] ${QT_QTCORE_LIBRARY} ... ${QT_QTGUI_LIBRARY} ${catkin_LIBRARIES} )