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file(GLOB QWT_INCLUDE_DIR "/usr/include/qwt")
include_directories(include ${catkin_INCLUDE_DIRS} ${QWT_INCLUDE_DIR})

and

file(GLOB QWT_LIBRARIES "/usr/lib/libqwt*")
target_link_libraries(<your_program> ${QT_LIBRARIES} ${catkin_LIBRARIES} ${QWT_LIBRARIES})

worked for me.

My qwt stuff were in /usr/include/qwt folder; not in /usr/include/qwt-qt4

cheers!

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